diff --git a/lib/MySQL_Session.cpp b/lib/MySQL_Session.cpp
index f1c9a9903..fa04eaf37 100644
--- a/lib/MySQL_Session.cpp
+++ b/lib/MySQL_Session.cpp
@@ -657,6 +657,7 @@ MySQL_Session::MySQL_Session() {
 
 	current_hostgroup=-1;
 	default_hostgroup=-1;
+	previous_hostgroup=-1;
 	locked_on_hostgroup=-1;
 	locked_on_hostgroup_and_all_variables_set=false;
 	next_query_flagIN=-1;