diff --git a/a8/sysutils.cc b/a8/sysutils.cc
index 068fa27..bfca194 100644
--- a/a8/sysutils.cc
+++ b/a8/sysutils.cc
@@ -188,7 +188,7 @@ namespace a8
     time_t GetDateTimeSeconds(const char* datetime_str)
     {
         int g_time_zone = 8;
-        struct tm stm;
+        struct tm stm = {0};
         strptime(datetime_str, "%Y-%m-%d %H:%M:%S", &stm);
         long t = mktime(&stm);
         return t + g_time_zone*3600;