diff --git a/lib/MySQL_Monitor.cpp b/lib/MySQL_Monitor.cpp
index a776aa595..9f18d6c89 100644
--- a/lib/MySQL_Monitor.cpp
+++ b/lib/MySQL_Monitor.cpp
@@ -4671,8 +4671,7 @@ void* monitor_dns_resolver_thread(void* args) {
 			bool to_update_cache = false;
 			int cache_ttl = dns_resolve_data->ttl;
 			if (dns_resolve_data->ttl > dns_resolve_data->refresh_intv) {
-				std::random_device rd;
-				std::mt19937 gen(rd());
+				thread_local std::mt19937 gen(std::random_device{}());
 				const int jitter = static_cast<int>(dns_resolve_data->ttl * 0.025);
 				std::uniform_int_distribution<int> dis(-jitter, jitter);
 				cache_ttl += dis(gen);