diff --git a/mozilla/config/make-jars.pl b/mozilla/config/make-jars.pl
index ea3277b4fb6..5ee3d59ad3d 100644
--- a/mozilla/config/make-jars.pl
+++ b/mozilla/config/make-jars.pl
@@ -470,7 +470,7 @@ sub EnsureFileInDir
         unlink $destPath;       # in case we had a symlink on unix
         if ($preproc) {
             my $preproc_flags = '';
-            if ($srcFile =~ /\.css$/o) {
+            if ($srcPath =~ /\.css$/o) {
                 $preproc_flags = '--marker=%';
             }