diff --git a/platform/src/ssl_service_cache.cpp b/platform/src/ssl_service_cache.cpp
index 3bdb926..e005450 100644
--- a/platform/src/ssl_service_cache.cpp
+++ b/platform/src/ssl_service_cache.cpp
@@ -146,10 +146,11 @@ static long cli_st_write_cb(void * data, const uchar * key, uint size, void * us
 	{
 		cli_st=ALLOC(struct ssl_svc_client_st, 1);
 		cli_st->ref_svc_cache=cache;
+		cli_st->last_update_time = now;
 		ret = MESA_htable_add(cache->cli_st_hash, key, size, cli_st);
 		assert(ret >= 0);
 	}
-	if(cli_st->last_update_time-now>cache->fail_time_window)
+	if (now - cli_st->last_update_time > cache->fail_time_window)
 	{
 		if(cli_st->suspect_pinning_count<cache->fail_as_pinning_count)	cli_st->suspect_pinning_count=0;
 		if(cli_st->protocol_error_count<cache->fail_as_proto_err_count)	cli_st->protocol_error_count=0;