diff --git a/content/base/src/nsFrameMessageManager.cpp b/content/base/src/nsFrameMessageManager.cpp
index f170ea7b3273..618182ed3e50 100644
--- a/content/base/src/nsFrameMessageManager.cpp
+++ b/content/base/src/nsFrameMessageManager.cpp
@@ -679,5 +679,5 @@ nsFrameScriptExecutor::LoadFrameScriptInternal(const nsAString& aURL)
   }
 }
 
-NS_IMPL_ISUPPORTS1(nsScriptCacheCleaner, nsIObserver);
+NS_IMPL_ISUPPORTS1(nsScriptCacheCleaner, nsIObserver)