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diff --git a/clang/test/CodeGenObjC/2009-01-26-WriteBarrier-2.m b/clang/test/CodeGenObjC/2009-01-26-WriteBarrier-2.m
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+++ b/clang/test/CodeGenObjC/2009-01-26-WriteBarrier-2.m
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -fblocks -emit-llvm %s -fobjc-gc -o - | FileCheck %s
+
+// CHECK: objc_assign_strongCast
+// rdar://5541393
+
+typedef __SIZE_TYPE__ size_t;
+void * malloc(size_t size);
+
+typedef struct {
+ void (^ivarBlock)(void);
+} StructWithBlock_t;
+
+int main(int argc, char *argv[]) {
+ StructWithBlock_t *swbp = (StructWithBlock_t *)malloc(sizeof(StructWithBlock_t*));
+ __block int i = 10;
+ // assigning a Block into an struct slot should elicit a write-barrier under GC
+ swbp->ivarBlock = ^ { ++i; };
+ return 0;
+}