diff --git a/cpp/utils.cc b/cpp/utils.cc
index 38255a2..bbe2b56 100644
--- a/cpp/utils.cc
+++ b/cpp/utils.cc
@@ -5,6 +5,7 @@
 #include <a8/udplog.h>
 #include <a8/mysql.h>
 #include <a8/openssl.h>
+#include <a8/strutils.h>
 
 #include <google/protobuf/message.h>
 
@@ -351,13 +352,14 @@ namespace f8
 
     bool IsOnlineEnv()
     {
-        return !getenv("SERVER_ENV");
+        static bool is_online = !getenv("SERVER_ENV");
+        return is_online;
     }
 
     bool IsTestEnv()
     {
-        char* env = getenv("SERVER_ENV");
-        return std::string(env) == "TEST";
+        static bool is_test = a8::SafeStrCmp(getenv("SERVER_ENV"), "TEST") == 0;
+        return is_test;
     }
 
     bool IsValidNormalConfig(a8::XObject& conf, std::vector<std::string> fields)