diff --git a/tool b/tool
index 877cd43..d5a93c0 100755
--- a/tool
+++ b/tool
@@ -303,7 +303,7 @@ build_target() {
         # add cc_flags -fsanitize=leak
       fi
       case $cc_id in
-        tcc) add cc_flags -g -bt 10;;
+        tcc) add cc_flags -g -bt10;;
       esac
       ;;
     release)