diff --git a/mozilla/caps/src/nsScriptSecurityManager.cpp b/mozilla/caps/src/nsScriptSecurityManager.cpp
index 0bce62a701e..61349c96196 100644
--- a/mozilla/caps/src/nsScriptSecurityManager.cpp
+++ b/mozilla/caps/src/nsScriptSecurityManager.cpp
@@ -1775,7 +1775,7 @@ nsScriptSecurityManager::GetCodebasePrincipal(nsIURI *aURI,
     return NS_OK;
 }
 
-nsresult
+NS_IMETHODIMP
 nsScriptSecurityManager::GetPrincipalFromContext(JSContext *cx,
                                                  nsIPrincipal **result)
 {