diff --git a/lib/Sema/SemaExprObjC.cpp b/lib/Sema/SemaExprObjC.cpp
index c769b856cd..cacc846028 100644
--- a/lib/Sema/SemaExprObjC.cpp
+++ b/lib/Sema/SemaExprObjC.cpp
@@ -324,6 +324,12 @@ bool Sema::CheckMessageArgumentTypes(Expr **Args, unsigned NumArgs,
                        Args[NumArgs-1]->getLocEnd());
     }
   }
+  // diagnose nonnull arguments.
+  for (specific_attr_iterator<NonNullAttr>
+       i = Method->specific_attr_begin<NonNullAttr>(),
+       e = Method->specific_attr_end<NonNullAttr>(); i != e; ++i) {
+    CheckNonNullArguments(*i, Args, lbrac);
+  }
 
   DiagnoseSentinelCalls(Method, lbrac, Args, NumArgs);
   return IsError;
diff --git a/test/SemaObjC/nonnull.m b/test/SemaObjC/nonnull.m
index 6c45d97b06..76c6ffa229 100644
--- a/test/SemaObjC/nonnull.m
+++ b/test/SemaObjC/nonnull.m
@@ -67,3 +67,30 @@ void func6(dispatch_object_t _head) {
   _dispatch_queue_push_list(_head._do);  // no warning
 }
 
+// rdar://9287695
+#define NULL (void*)0
+
+@interface NSObject 
+- (void)doSomethingWithNonNullPointer:(void *)ptr :(int)iarg : (void*)ptr1 __attribute__((nonnull(1, 3)));
++ (void)doSomethingClassyWithNonNullPointer:(void *)ptr __attribute__((nonnull(1)));
+@end
+
+extern void DoSomethingNotNull(void *db) __attribute__((nonnull(1)));
+
+@interface IMP 
+{
+  void * vp;
+}
+@end
+
+@implementation IMP
+- (void) Meth {
+  NSObject *object;
+  [object doSomethingWithNonNullPointer:NULL:1:NULL]; // expected-warning 2 {{null passed to a callee which requires a non-null argument}}
+  [object doSomethingWithNonNullPointer:vp:1:NULL]; // expected-warning {{null passed to a callee which requires a non-null argument}}
+  [NSObject doSomethingClassyWithNonNullPointer:NULL]; // expected-warning {{null passed to a callee which requires a non-null argument}}
+  DoSomethingNotNull(NULL); // expected-warning {{null passed to a callee which requires a non-null argument}}
+  [object doSomethingWithNonNullPointer:vp:1:vp];
+}
+@end
+