diff --git a/src/asm/symbol.c b/src/asm/symbol.c
index 0fd7ba65..00704624 100644
--- a/src/asm/symbol.c
+++ b/src/asm/symbol.c
@@ -409,6 +409,7 @@ struct Symbol *sym_AddSet(char const *symName, int32_t value)
 		      symName, sym->type == SYM_LABEL ? "label" : "constant");
 		dumpFilename(sym);
 		putc('\n', stderr);
+		return sym;
 	} else {
 		/* TODO: can the scope be incorrect when taking over refs? */
 		updateSymbolFilename(sym);
diff --git a/test/asm/narg-overwrite.asm b/test/asm/narg-overwrite.asm
new file mode 100644
index 00000000..5a60b8e0
--- /dev/null
+++ b/test/asm/narg-overwrite.asm
@@ -0,0 +1,2 @@
+_NARG = 0
+_NARG = 0
diff --git a/test/asm/narg-overwrite.err b/test/asm/narg-overwrite.err
new file mode 100644
index 00000000..033298ce
--- /dev/null
+++ b/test/asm/narg-overwrite.err
@@ -0,0 +1,5 @@
+ERROR: narg-overwrite.asm(1):
+    '_NARG' already defined as constant at <builtin>
+ERROR: narg-overwrite.asm(2):
+    '_NARG' already defined as constant at <builtin>
+error: Assembly aborted (2 errors)!
diff --git a/test/asm/narg-overwrite.out b/test/asm/narg-overwrite.out
new file mode 100644
index 00000000..e69de29b