diff --git a/reactos/lib/sdk/crt/string/tcsrchr.h b/reactos/lib/sdk/crt/string/tcsrchr.h
index 7e30c1a3aa7..354003273db 100644
--- a/reactos/lib/sdk/crt/string/tcsrchr.h
+++ b/reactos/lib/sdk/crt/string/tcsrchr.h
@@ -3,7 +3,7 @@
 
 #include <tchar.h>
 
-_TCHAR * _tcsrchr(const _TCHAR * s, _TCHAR c)
+_TCHAR * _tcsrchr(const _TCHAR * s, _XINT c)
 {
  _TCHAR cc = c;
  const _TCHAR * sp = (_TCHAR *)0;