diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 3878341..da0fa3e 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -1493,9 +1493,11 @@
   for (specific_attr_iterator<InheritableAttr>
        i = oldDecl->specific_attr_begin<InheritableAttr>(),
        e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) {
-    // Ignore deprecated and unavailable attributes if requested.
+    // Ignore deprecated/unavailable/availability attributes if requested.
     if (!mergeDeprecation &&
-        (isa<DeprecatedAttr>(*i) || isa<UnavailableAttr>(*i)))
+        (isa<DeprecatedAttr>(*i) || 
+         isa<UnavailableAttr>(*i) ||
+         isa<AvailabilityAttr>(*i)))
       continue;
 
     if (!DeclHasAttr(newDecl, *i)) {
diff --git a/test/SemaObjC/attr-availability.m b/test/SemaObjC/attr-availability.m
new file mode 100644
index 0000000..8511d13
--- /dev/null
+++ b/test/SemaObjC/attr-availability.m
@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+@interface A
+- (void)method __attribute__((availability(macosx,introduced=10.1,deprecated=10.2)));
+@end
+
+@interface B : A
+- (void)method;
+@end
+
+void f(A *a, B *b) {
+  [a method]; // expected-warning{{'method' is deprecated: first deprecated in Mac OS X 10.2}}
+  [b method];
+}