diff --git a/src/components/script/dom/bindings/codegen/CodegenRust.py b/src/components/script/dom/bindings/codegen/CodegenRust.py
index 055cb0ce488..5ae7091814b 100644
--- a/src/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/src/components/script/dom/bindings/codegen/CodegenRust.py
@@ -39,6 +39,8 @@ def replaceFileIfChanged(filename, newContents):
     f.write(newContents)
     f.close()
 
+    return True
+
 def toStringBool(arg):
     return str(not not arg).lower()