diff --git a/src/asm/parser.y b/src/asm/parser.y
index b40d7432..a88f2a7d 100644
--- a/src/asm/parser.y
+++ b/src/asm/parser.y
@@ -525,7 +525,8 @@ macroargs:
 			fatalerror("Failed to allocate memory for macro arguments: %s\n", strerror(errno));
 	}
 	| macroargs T_STRING {
-		$$->append($2);
+		$1->append($2);
+		$$ = $1;
 	}
 ;