diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 975a963..d5112a2 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -6715,6 +6715,19 @@
     // shouldn't be diagnosing.
     LookupName(Previous, S);
 
+    if (Previous.isAmbiguous() && TUK == TUK_Definition) {
+      LookupResult::Filter F = Previous.makeFilter();
+      while (F.hasNext()) {
+        NamedDecl *ND = F.next();
+        if (ND->getDeclContext()->getRedeclContext() != SearchDC)
+          F.erase();
+      }
+      F.done();
+      
+      if (Previous.isAmbiguous())
+        return 0;
+    }
+    
     // Note:  there used to be some attempt at recovery here.
     if (Previous.isAmbiguous())
       return 0;
diff --git a/clang/test/SemaCXX/tag-ambig.cpp b/clang/test/SemaCXX/tag-ambig.cpp
new file mode 100644
index 0000000..42cb960
--- /dev/null
+++ b/clang/test/SemaCXX/tag-ambig.cpp
@@ -0,0 +1,17 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+// <rdar://problem/9168556>
+typedef struct Point Point;
+
+namespace NameSpace {
+  class Point;
+}
+
+using namespace NameSpace;
+
+class Test
+{
+public:
+  struct Point { };
+  virtual bool testMethod (Test::Point& p) = 0;
+};