diff --git a/base/src/unicode_ex.cpp b/base/src/unicode_ex.cpp
index da2caed..cad6b43 100755
--- a/base/src/unicode_ex.cpp
+++ b/base/src/unicode_ex.cpp
@@ -17,6 +17,7 @@
 #include "utils_log.h"
 #include <cstdio>
 #include <cstdlib>
+#include <limits.h>
 using namespace std;
 /***************************************UTF8 and UTF16 unicode**********************************************
 UTF8