diff --git a/lib/MySQL_Thread.cpp b/lib/MySQL_Thread.cpp
index bd2aaab0e..c3eddea2f 100644
--- a/lib/MySQL_Thread.cpp
+++ b/lib/MySQL_Thread.cpp
@@ -4313,7 +4313,7 @@ void MySQL_Thread::idle_thread_to_kill_idle_sessions() {
 	for (i=0;i<SESS_TO_SCAN && mysess_idx < mysql_sessions->len; i++) {
 		uint32_t sess_pos=mysess_idx;
 		MySQL_Session *mysess=(MySQL_Session *)mysql_sessions->index(sess_pos);
-		if (mysess->idle_since < min_idle) {
+		if (mysess->idle_since < min_idle || mysess->killed==true) {
 			mysess->killed=true;
 			MySQL_Data_Stream *tmp_myds=mysess->client_myds;
 			int dsidx=tmp_myds->poll_fds_idx;