diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index fd2df0799c6..c9271bb03dc 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -6207,7 +6207,7 @@ class CGDictionary(CGThing):
                                          descriptorProvider,
                                          isMember="Dictionary",
                                          defaultValue=member.defaultValue,
-                                         exceptionCode="return Err(());"))
+                                         exceptionCode="return Err(());\n"))
             for member in dictionary.members]
 
     def define(self):