diff --git a/test/asm/anon-label-bad.simple.err b/test/asm/anon-label-bad.simple.err
deleted file mode 100644
index 87274794..00000000
--- a/test/asm/anon-label-bad.simple.err
+++ /dev/null
@@ -1,11 +0,0 @@
-error: anon-label-bad.asm(2):
-    Label "!0" created outside of a SECTION
-error: anon-label-bad.asm(6):
-    Reference to anonymous label 2 before, when only 1 has been created so far
-error: anon-label-bad.asm(9):
-    syntax error
-error: anon-label-bad.asm(10):
-    syntax error
-error: anon-label-bad.asm(22):
-    syntax error
-error: Assembly aborted (5 errors)!
diff --git a/test/asm/block-comment-termination-error.simple.err b/test/asm/block-comment-termination-error.simple.err
deleted file mode 100644
index 2517422b..00000000
--- a/test/asm/block-comment-termination-error.simple.err
+++ /dev/null
@@ -1,5 +0,0 @@
-error: block-comment-termination-error.asm(1):
-    Unterminated block comment
-error: block-comment-termination-error.asm(1):
-    syntax error
-error: Assembly aborted (2 errors)!
diff --git a/test/asm/def.simple.err b/test/asm/def.simple.err
deleted file mode 100644
index a503bb5d..00000000
--- a/test/asm/def.simple.err
+++ /dev/null
@@ -1,5 +0,0 @@
-error: def.asm(23):
-    'constant' already defined at def.asm(10)
-error: def.asm(29):
-    syntax error
-error: Assembly aborted (2 errors)!
diff --git a/test/asm/error-recovery.simple.err b/test/asm/error-recovery.simple.err
deleted file mode 100644
index 3f270237..00000000
--- a/test/asm/error-recovery.simple.err
+++ /dev/null
@@ -1,5 +0,0 @@
-error: error-recovery.asm(3):
-    syntax error
-error: error-recovery.asm(5) -> error-recovery.asm::REPT~1(7):
-    syntax error
-error: Assembly aborted (2 errors)!
diff --git a/test/asm/expand-empty-string.simple.err b/test/asm/expand-empty-string.simple.err
deleted file mode 100644
index be33f0b9..00000000
--- a/test/asm/expand-empty-string.simple.err
+++ /dev/null
@@ -1,3 +0,0 @@
-error: expand-empty-string.asm(6) -> expand-empty-string.asm::test(4):
-    syntax error
-error: Assembly aborted (1 error)!
diff --git a/test/asm/label-macro-arg.simple.err b/test/asm/label-macro-arg.simple.err
deleted file mode 100644
index cd9ef65e..00000000
--- a/test/asm/label-macro-arg.simple.err
+++ /dev/null
@@ -1,28 +0,0 @@
-warning: label-macro-arg.asm(13) -> label-macro-arg.asm::m2(9): [-Wobsolete]
-    `y =` is deprecated; use `DEF y =`
-warning: label-macro-arg.asm(15) -> label-macro-arg.asm::m2(9): [-Wobsolete]
-    `yy =` is deprecated; use `DEF yy =`
-error: label-macro-arg.asm(38) -> label-macro-arg.asm::test_char(25):
-    Local label 'sizeof_.something' in main scope
-while expanding symbol "VAR_DEF"
-error: label-macro-arg.asm(38) -> label-macro-arg.asm::test_char(25):
-    syntax error
-while expanding symbol "VAR_DEF"
-error: label-macro-arg.asm(38) -> label-macro-arg.asm::test_char(26):
-    Local label 'sizeof_.something' in main scope
-error: label-macro-arg.asm(38) -> label-macro-arg.asm::test_char(29):
-    Interpolated symbol "sizeof_.something" does not exist
-error: label-macro-arg.asm(39) -> label-macro-arg.asm::test_char(25):
-    Label "sizeof_" created outside of a SECTION
-while expanding symbol "VAR_DEF"
-error: label-macro-arg.asm(39) -> label-macro-arg.asm::test_char(25):
-    Macro "something" not defined
-error: label-macro-arg.asm(39) -> label-macro-arg.asm::test_char(26):
-    'sizeof_' already defined at label-macro-arg.asm(39) -> label-macro-arg.asm::test_char(25)
-error: label-macro-arg.asm(39) -> label-macro-arg.asm::test_char(26):
-    Macro "something" not defined
-error: label-macro-arg.asm(39) -> label-macro-arg.asm::test_char(29):
-    Invalid format spec 'sizeof_'
-error: label-macro-arg.asm(39) -> label-macro-arg.asm::test_char(29):
-    Interpolated symbol "something" does not exist
-error: Assembly aborted (10 errors)!
diff --git a/test/asm/macro-syntax.simple.err b/test/asm/macro-syntax.simple.err
deleted file mode 100644
index cb1baf18..00000000
--- a/test/asm/macro-syntax.simple.err
+++ /dev/null
@@ -1,9 +0,0 @@
-error: macro-syntax.asm(7):
-    Label "old" created outside of a SECTION
-error: macro-syntax.asm(7):
-    syntax error
-error: macro-syntax.asm(8):
-    '\1' cannot be used outside of a macro
-error: macro-syntax.asm(9):
-    syntax error
-error: Assembly aborted (4 errors)!
diff --git a/test/asm/nested-macrodef.simple.err b/test/asm/nested-macrodef.simple.err
deleted file mode 100644
index 7df121d6..00000000
--- a/test/asm/nested-macrodef.simple.err
+++ /dev/null
@@ -1,7 +0,0 @@
-warning: nested-macrodef.asm(26) -> nested-macrodef.asm::outer(22): [-Wuser]
-    Nested macros shouldn't work, whose argument would be \1?
-error: nested-macrodef.asm(26) -> nested-macrodef.asm::outer(24):
-    Unterminated macro definition
-error: nested-macrodef.asm(27):
-    syntax error
-error: Assembly aborted (2 errors)!
diff --git a/test/asm/period.simple.err b/test/asm/period.simple.err
deleted file mode 100644
index 22a4095e..00000000
--- a/test/asm/period.simple.err
+++ /dev/null
@@ -1,3 +0,0 @@
-error: period.asm(5):
-    syntax error
-error: Assembly aborted (1 error)!
diff --git a/test/asm/syntax-error-after-syntax-error.simple.err b/test/asm/syntax-error-after-syntax-error.simple.err
deleted file mode 100644
index 66caa7f9..00000000
--- a/test/asm/syntax-error-after-syntax-error.simple.err
+++ /dev/null
@@ -1,13 +0,0 @@
-error: syntax-error-after-syntax-error.asm(6):
-    syntax error
-error: syntax-error-after-syntax-error.asm(7):
-    syntax error
-    To invoke `mac` as a macro it must be indented
-error: syntax-error-after-syntax-error.asm(8):
-    syntax error
-    To invoke `mac` as a macro it must be indented
-error: syntax-error-after-syntax-error.asm(9):
-    'mac' already defined at syntax-error-after-syntax-error.asm(1)
-error: syntax-error-after-syntax-error.asm(10):
-    'mac' already defined at syntax-error-after-syntax-error.asm(1)
-error: Assembly aborted (5 errors)!
diff --git a/test/asm/syntax-error-eof-newline.simple.err b/test/asm/syntax-error-eof-newline.simple.err
deleted file mode 100644
index 7a5f4a63..00000000
--- a/test/asm/syntax-error-eof-newline.simple.err
+++ /dev/null
@@ -1,3 +0,0 @@
-error: syntax-error-eof-newline.asm(5) -> syntax-error-eof-newline.inc(1):
-    syntax error
-error: Assembly aborted (1 error)!
diff --git a/test/asm/syntax-error.simple.err b/test/asm/syntax-error.simple.err
deleted file mode 100644
index 0d72e0ba..00000000
--- a/test/asm/syntax-error.simple.err
+++ /dev/null
@@ -1,3 +0,0 @@
-error: syntax-error.asm(2):
-    syntax error
-error: Assembly aborted (1 error)!
diff --git a/test/asm/test.sh b/test/asm/test.sh
index 1ccc940d..d4b115ac 100755
--- a/test/asm/test.sh
+++ b/test/asm/test.sh
@@ -59,15 +59,6 @@ else
 	rm -f version.asm
 fi
 
-# Check whether to use '.simple.err' files if they exist
-# (rgbasm with pre-3.0 Bison just reports "syntax error")
-$RGBASM -Weverything -o "$o" syntax-error.asm >"$output" 2>"$errput"
-simple_error=0
-if ! diff --strip-trailing-cr syntax-error.err "$errput"; then
-	echo "${bold}${orange}Warning: using .simple.err files when available.${rescolors}${resbold}"
-	simple_error=1
-fi
-
 for i in *.asm; do
 	flags=${i%.asm}.flags
 	RGBASMFLAGS=-Weverything
@@ -82,9 +73,7 @@ for i in *.asm; do
 		else
 			desired_outname=/dev/null
 		fi
-		if [ "$simple_error" -eq 1 ] && [ -e "${i%.asm}.simple.err" ]; then
-			desired_errname=${i%.asm}.simple.err
-		elif [ -e "${i%.asm}.err" ]; then
+		if [ -e "${i%.asm}.err" ]; then
 			desired_errname=${i%.asm}.err
 		else
 			desired_errname=/dev/null