diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index 89bf8d0..d181f35 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -1449,7 +1449,7 @@
 
     // <class-enum-type> ::= <name>
     // <name> ::= <nested-name>
-    mangleUnresolvedPrefix(Dependent->getQualifier(), nullptr);
+    mangleUnresolvedPrefix(Dependent->getQualifier());
     mangleSourceName(Dependent->getIdentifier());
     break;
   }