diff --git a/FFI-tests/ffi_test.c b/FFI-tests/ffi_test.c
index 444b869..94e5c4c 100644
--- a/FFI-tests/ffi_test.c
+++ b/FFI-tests/ffi_test.c
@@ -3,7 +3,6 @@
 #include <stdint.h>
 #include <dlfcn.h>
 #include <string.h>
-#include <wchar.h>
 
 /* function declaration */
 void print_ustr_bytes(const char []);