diff --git a/macros/asserts.asm b/macros/asserts.asm
index e3142c982..ac7ead39f 100644
--- a/macros/asserts.asm
+++ b/macros/asserts.asm
@@ -38,7 +38,7 @@ MACRO list_start
 ENDM
 
 MACRO li
-	assert STRFIND(\1, "@") == -1, STRCAT("String terminator \"@\" in list entry: ", \1)
+	assert STRFIND(\1, "@") == -1, "String terminator \"@\" in list entry: \1"
 	db \1, "@"
 	DEF list_index += 1
 ENDM