diff --git a/test/FrontendC/memset_chk.c b/test/FrontendC/memset_chk.c
new file mode 100644
index 00000000000..b347dd0b7e7
--- /dev/null
+++ b/test/FrontendC/memset_chk.c
@@ -0,0 +1,6 @@
+// RUN: %llvmgcc -S -emit-llvm -O1 %s -o - | grep call | not grep memset_chk
+// rdar://6728562
+
+void t(void *ptr) {
+  __builtin___memset_chk(ptr, 0, 32, __builtin_object_size (ptr, 0));
+}