diff --git a/src/Frontend/Compiler/JsCompiler.php b/src/Frontend/Compiler/JsCompiler.php
index 9bf5719e6..b86a42044 100644
--- a/src/Frontend/Compiler/JsCompiler.php
+++ b/src/Frontend/Compiler/JsCompiler.php
@@ -67,7 +67,7 @@ class JsCompiler extends RevisionCompiler
      */
     protected function format(string $string): string
     {
-        return preg_replace('~//# sourceMappingURL.*$~s', '', $string).";\n";
+        return preg_replace('~//# sourceMappingURL.*$~m', '', $string).";\n";
     }
 
     /**