diff --git a/lib/AST/DeclBase.cpp b/lib/AST/DeclBase.cpp
index c693e15..b1585a3 100644
--- a/lib/AST/DeclBase.cpp
+++ b/lib/AST/DeclBase.cpp
@@ -257,13 +257,6 @@
     case ObjCProtocol:
       return IDNS_ObjCProtocol;
 
-    case ObjCImplementation:
-      return IDNS_ObjCImplementation;
-
-    case ObjCCategory:
-    case ObjCCategoryImpl:
-      return IDNS_ObjCCategoryName;
-
     case Field:
     case ObjCAtDefsField:
     case ObjCIvar:
@@ -295,10 +288,13 @@
     case Block:
     case TranslationUnit:
 
-    // Aren't looked up?
     case UsingDirective:
     case ClassTemplateSpecialization:
     case ClassTemplatePartialSpecialization:
+    case ObjCImplementation:
+    case ObjCCategory:
+    case ObjCCategoryImpl:
+      // Never looked up by name.
       return 0;
   }