diff --git a/lib/Basic/Diagnostic.cpp b/lib/Basic/Diagnostic.cpp
index 6ba5907..922702f 100644
--- a/lib/Basic/Diagnostic.cpp
+++ b/lib/Basic/Diagnostic.cpp
@@ -797,6 +797,7 @@
     case Diagnostic::ak_qualtype:
     case Diagnostic::ak_declarationname:
     case Diagnostic::ak_nameddecl:
+    case Diagnostic::ak_nestednamespec:
       getDiags()->ConvertArgToString(getArgKind(ArgNo), getRawArg(ArgNo),
                                      Modifier, ModifierLen,
                                      Argument, ArgumentLen, OutStr);