diff --git a/test/CodeGen/pr13168.c b/test/CodeGen/pr13168.c
new file mode 100644
index 0000000000..a848af472c
--- /dev/null
+++ b/test/CodeGen/pr13168.c
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -emit-llvm %s -o -
+
+typedef int (*_MD_Open64)(int oflag, ...);
+_MD_Open64 _open64;
+void PR_OpenFile(int mode) {
+_open64(0, mode);
+}