diff --git a/lib/CodeGen/CGCall.cpp b/lib/CodeGen/CGCall.cpp
index d2ad5dc..e3b93a3 100644
--- a/lib/CodeGen/CGCall.cpp
+++ b/lib/CodeGen/CGCall.cpp
@@ -954,9 +954,13 @@
         if (Arg->getType().isRestrictQualified())
           AI->addAttr(llvm::Attribute::NoAlias);
 
+        // Ensure the argument is the correct type.
+        if (V->getType() != ArgI.getCoerceToType())
+          V = Builder.CreateBitCast(V, ArgI.getCoerceToType());
+
         if (isPromoted)
           V = emitArgumentDemotion(*this, Arg, V);
-
+        
         EmitParmDecl(*Arg, V, ArgNo);
         break;
       }
diff --git a/test/CodeGenObjCXX/copy.mm b/test/CodeGenObjCXX/copy.mm
index 133910f..e97ca79 100644
--- a/test/CodeGenObjCXX/copy.mm
+++ b/test/CodeGenObjCXX/copy.mm
@@ -24,3 +24,18 @@
   }
 }
 
+
+// rdar://9780211
+@protocol bork
+@end
+
+namespace test1 {
+template<typename T> struct RetainPtr {
+  RetainPtr() {}
+};
+
+
+RetainPtr<id<bork> > x;
+RetainPtr<id> y;
+
+}