diff --git a/test/Preprocessor/header_lookup1.c b/test/Preprocessor/header_lookup1.c
new file mode 100644
index 0000000..10049ad
--- /dev/null
+++ b/test/Preprocessor/header_lookup1.c
@@ -0,0 +1,2 @@
+// RUN: clang -I /usr/include %s -E | grep 'stdio.h.*3.*4'
+#include <stdio.h>