diff --git a/test/FrontendC/wchar-const.c b/test/FrontendC/wchar-const.c
index 0cb5ecb4a88..7cf3322e8cf 100644
--- a/test/FrontendC/wchar-const.c
+++ b/test/FrontendC/wchar-const.c
@@ -1,6 +1,6 @@
 // RUN: %llvmgcc -S %s -o - | grep {constant \\\[18 x} | grep { 84, }
 // This should pass for any endianness combination of host and target.
-#include <ctype.h>
+#include <wchar.h>
 extern void foo(const wchar_t* p);
 int main (int argc, const char * argv[])
 {