diff --git a/src/asm/main.c b/src/asm/main.c
index d8952605..ea25224a 100644
--- a/src/asm/main.c
+++ b/src/asm/main.c
@@ -353,7 +353,8 @@ int main(int argc, char *argv[])
 	sect_CheckUnionClosed();
 
 	if (nbErrors != 0)
-		errx(1, "Assembly aborted (%u errors)!", nbErrors);
+		errx(1, "Assembly aborted (%u error%s)!", nbErrors,
+			nbErrors == 1 ? "" : "s");
 
 	// If parse aborted due to missing an include, and `-MG` was given, exit normally
 	if (oFailedOnMissingInclude)
diff --git a/test/asm/align-large-ofs.err b/test/asm/align-large-ofs.err
index fa1951fd..7b31f54c 100644
--- a/test/asm/align-large-ofs.err
+++ b/test/asm/align-large-ofs.err
@@ -1,3 +1,3 @@
 ERROR: align-large-ofs.asm(2):
     Alignment offset (2) must be smaller than alignment size (2)
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/assert-nosect-bank.err b/test/asm/assert-nosect-bank.err
index 0477a71a..280a273e 100644
--- a/test/asm/assert-nosect-bank.err
+++ b/test/asm/assert-nosect-bank.err
@@ -1,3 +1,3 @@
 ERROR: assert-nosect-bank.asm(1):
     PC has no bank outside a section
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/assert@-no-sect.err b/test/asm/assert@-no-sect.err
index 68c7d037..7a5ca267 100644
--- a/test/asm/assert@-no-sect.err
+++ b/test/asm/assert@-no-sect.err
@@ -1,3 +1,3 @@
 ERROR: assert@-no-sect.asm(1):
     PC has no value outside a section
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/deprecated-pi.err b/test/asm/deprecated-pi.err
index 0e0f5834..ffddcce0 100644
--- a/test/asm/deprecated-pi.err
+++ b/test/asm/deprecated-pi.err
@@ -2,4 +2,4 @@ warning: deprecated-pi.asm(2): [-Wobsolete]
     `_PI` is deprecated; use 3.14159
 ERROR: deprecated-pi.asm(3):
     Built-in symbol '_PI' cannot be purged
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/ds-bad.err b/test/asm/ds-bad.err
index f5678b2c..1ec092a0 100644
--- a/test/asm/ds-bad.err
+++ b/test/asm/ds-bad.err
@@ -2,4 +2,4 @@ ERROR: ds-bad.asm(3):
     Expected constant expression: 'unknown' is not constant at assembly time
 warning: ds-bad.asm(4): [-Wtruncation]
     Expression must be 8-bit
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/fragment-align.err b/test/asm/fragment-align.err
index cd9fa202..0c3f8e2d 100644
--- a/test/asm/fragment-align.err
+++ b/test/asm/fragment-align.err
@@ -1,3 +1,3 @@
 ERROR: fragment-align.asm(25):
     Section's alignment fails required alignment (offset from section start = $0004)
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/garbage_char.err b/test/asm/garbage_char.err
index 7f51a3e4..d7bb40f3 100644
--- a/test/asm/garbage_char.err
+++ b/test/asm/garbage_char.err
@@ -1,3 +1,3 @@
 ERROR: garbage_char.asm(1):
     Unknown character 0xFF
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/if@-no-sect.err b/test/asm/if@-no-sect.err
index 197db7bd..da640237 100644
--- a/test/asm/if@-no-sect.err
+++ b/test/asm/if@-no-sect.err
@@ -1,3 +1,3 @@
 ERROR: if@-no-sect.asm(1):
     PC has no value outside a section
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/incbin-empty-bad.err b/test/asm/incbin-empty-bad.err
index 5c15becc..59c05f97 100644
--- a/test/asm/incbin-empty-bad.err
+++ b/test/asm/incbin-empty-bad.err
@@ -1,3 +1,3 @@
 ERROR: incbin-empty-bad.asm(3):
     Specified range in INCBIN is out of bounds (0 + 1 > 0)
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/incbin-end-bad.err b/test/asm/incbin-end-bad.err
index 3a21f2b6..7d3ebb63 100644
--- a/test/asm/incbin-end-bad.err
+++ b/test/asm/incbin-end-bad.err
@@ -1,3 +1,3 @@
 ERROR: incbin-end-bad.asm(3):
     Specified range in INCBIN is out of bounds (123 + 1 > 123)
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/label-outside-section.err b/test/asm/label-outside-section.err
index 6aa561cd..904bf3bb 100644
--- a/test/asm/label-outside-section.err
+++ b/test/asm/label-outside-section.err
@@ -1,3 +1,3 @@
 ERROR: label-outside-section.asm(1):
     Label "bad" created outside of a SECTION
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/label-redefinition.err b/test/asm/label-redefinition.err
index 59664cf5..6f3fc268 100644
--- a/test/asm/label-redefinition.err
+++ b/test/asm/label-redefinition.err
@@ -1,3 +1,3 @@
 ERROR: label-redefinition.asm(7):
     'Sym' already defined at label-redefinition.asm(6) -> label-redefinition.asm::m(4)
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/line-continuation-whitespace.err b/test/asm/line-continuation-whitespace.err
index 83122438..978cddf6 100644
--- a/test/asm/line-continuation-whitespace.err
+++ b/test/asm/line-continuation-whitespace.err
@@ -1,3 +1,3 @@
 ERROR: line-continuation-whitespace.asm(7):
     Label "foo" created outside of a SECTION
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/line-continuation.err b/test/asm/line-continuation.err
index 4da7e2c1..249a5300 100644
--- a/test/asm/line-continuation.err
+++ b/test/asm/line-continuation.err
@@ -1,3 +1,3 @@
 ERROR: line-continuation.asm(7):
     Label "foo" created outside of a SECTION
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/load-rom.err b/test/asm/load-rom.err
index 32654082..ad93703c 100644
--- a/test/asm/load-rom.err
+++ b/test/asm/load-rom.err
@@ -1,3 +1,3 @@
 ERROR: load-rom.asm(3):
     `LOAD` blocks cannot create a ROM section
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/local-purge.err b/test/asm/local-purge.err
index 3daacd32..930431dc 100644
--- a/test/asm/local-purge.err
+++ b/test/asm/local-purge.err
@@ -1,3 +1,3 @@
 ERROR: local-purge.asm(8):
     Interpolated symbol ".loc" does not exist
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/local-without-parent.err b/test/asm/local-without-parent.err
index 71b4230c..63dfadc7 100644
--- a/test/asm/local-without-parent.err
+++ b/test/asm/local-without-parent.err
@@ -1,3 +1,3 @@
 ERROR: local-without-parent.asm(2):
     Local label '.test' in main scope
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/local-wrong-parent.err b/test/asm/local-wrong-parent.err
index 5eb4776f..a8d829dd 100644
--- a/test/asm/local-wrong-parent.err
+++ b/test/asm/local-wrong-parent.err
@@ -1,3 +1,3 @@
 ERROR: local-wrong-parent.asm(5):
     Not currently in the scope of 'WrongParent'
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/macro-arg-in-string.err b/test/asm/macro-arg-in-string.err
index 1b16204e..22a24c2e 100644
--- a/test/asm/macro-arg-in-string.err
+++ b/test/asm/macro-arg-in-string.err
@@ -1,3 +1,3 @@
 ERROR: macro-arg-in-string.asm(12):
     Illegal character escape '!'
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/multi-line-strings.err b/test/asm/multi-line-strings.err
index 47a604f4..d0740b6e 100644
--- a/test/asm/multi-line-strings.err
+++ b/test/asm/multi-line-strings.err
@@ -2,4 +2,4 @@ ERROR: multi-line-strings.asm(23):
     Unterminated string
 warning: multi-line-strings.asm(35): [-Wuser]
     check the line number
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/narg-nosect.err b/test/asm/narg-nosect.err
index 918c3b11..e0c42a3c 100644
--- a/test/asm/narg-nosect.err
+++ b/test/asm/narg-nosect.err
@@ -1,3 +1,3 @@
 ERROR: narg-nosect.asm(1):
     _NARG does not make sense outside of a macro
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/nested-brackets.err b/test/asm/nested-brackets.err
index 24035a4f..ca93680c 100644
--- a/test/asm/nested-brackets.err
+++ b/test/asm/nested-brackets.err
@@ -1,3 +1,3 @@
 ERROR: nested-brackets.asm(5):
     Missing }
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/null-in-macro.err b/test/asm/null-in-macro.err
index 4c11181a..c9148b8a 100644
--- a/test/asm/null-in-macro.err
+++ b/test/asm/null-in-macro.err
@@ -1,3 +1,3 @@
 ERROR: null-in-macro.asm(4) -> null-in-macro.asm::foo(2):
     Unknown character 0x00
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/period.err b/test/asm/period.err
index 5ff4f285..bcbd00b7 100644
--- a/test/asm/period.err
+++ b/test/asm/period.err
@@ -1,3 +1,3 @@
 ERROR: period.asm(5):
     syntax error, unexpected .
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/period.simple.err b/test/asm/period.simple.err
index b742ac7d..e7abb68c 100644
--- a/test/asm/period.simple.err
+++ b/test/asm/period.simple.err
@@ -1,3 +1,3 @@
 ERROR: period.asm(5):
     syntax error
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/purge-refs.err b/test/asm/purge-refs.err
index 8ad27dec..e7a98df0 100644
--- a/test/asm/purge-refs.err
+++ b/test/asm/purge-refs.err
@@ -1,3 +1,3 @@
 ERROR: purge-refs.asm(6):
     Symbol "Floating" is referenced and thus cannot be purged
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/purge.err b/test/asm/purge.err
index 74f81e69..daaf2c58 100644
--- a/test/asm/purge.err
+++ b/test/asm/purge.err
@@ -1,3 +1,3 @@
 ERROR: purge.asm(9):
     Symbol "Referenced" is referenced and thus cannot be purged
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/redef-equs.err b/test/asm/redef-equs.err
index 5b18352c..a0945214 100644
--- a/test/asm/redef-equs.err
+++ b/test/asm/redef-equs.err
@@ -1,3 +1,3 @@
 ERROR: redef-equs.asm(23):
     'N' already defined as non-EQUS at redef-equs.asm(22)
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/string-formatting.err b/test/asm/string-formatting.err
index 76a85473..99e09761 100644
--- a/test/asm/string-formatting.err
+++ b/test/asm/string-formatting.err
@@ -1,3 +1,3 @@
 ERROR: string-formatting.asm(10):
     Formatting string with prefix flag '#'
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/sym-collision.err b/test/asm/sym-collision.err
index 29a82c43..68a6dde0 100644
--- a/test/asm/sym-collision.err
+++ b/test/asm/sym-collision.err
@@ -1,3 +1,3 @@
 ERROR: sym-collision.asm(26):
     Interpolated symbol "dork" does not exist
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/syntax-error-eof-newline.err b/test/asm/syntax-error-eof-newline.err
index 2eaee123..fdb4616f 100644
--- a/test/asm/syntax-error-eof-newline.err
+++ b/test/asm/syntax-error-eof-newline.err
@@ -1,3 +1,3 @@
 ERROR: syntax-error-eof-newline.asm(5) -> syntax-error-eof-newline.inc(1):
     syntax error, unexpected newline
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/syntax-error-eof-newline.simple.err b/test/asm/syntax-error-eof-newline.simple.err
index 43f74631..1a50d4cc 100644
--- a/test/asm/syntax-error-eof-newline.simple.err
+++ b/test/asm/syntax-error-eof-newline.simple.err
@@ -1,3 +1,3 @@
 ERROR: syntax-error-eof-newline.asm(5) -> syntax-error-eof-newline.inc(1):
     syntax error
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/syntax-error.err b/test/asm/syntax-error.err
index f88f66a6..c3502a83 100644
--- a/test/asm/syntax-error.err
+++ b/test/asm/syntax-error.err
@@ -1,3 +1,3 @@
 ERROR: syntax-error.asm(2):
     syntax error, unexpected a
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/asm/syntax-error.simple.err b/test/asm/syntax-error.simple.err
index 2f55f331..49094a8f 100644
--- a/test/asm/syntax-error.simple.err
+++ b/test/asm/syntax-error.simple.err
@@ -1,3 +1,3 @@
 ERROR: syntax-error.asm(2):
     syntax error
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!
diff --git a/test/link/section-union/assert.out b/test/link/section-union/assert.out
index fa3c90e5..0bef2cb6 100644
--- a/test/link/section-union/assert.out
+++ b/test/link/section-union/assert.out
@@ -3,4 +3,4 @@ Linking failed with 1 error
 ---
 ERROR: <stdin>(30):
     Assertion failed: Force failing the build
-error: Assembly aborted (1 errors)!
+error: Assembly aborted (1 error)!