diff --git a/lib/ProxySQL_Admin.cpp b/lib/ProxySQL_Admin.cpp
index 9aebcdaa0e..342820fc0e 100644
--- a/lib/ProxySQL_Admin.cpp
+++ b/lib/ProxySQL_Admin.cpp
@@ -3935,10 +3935,10 @@ void ProxySQL_Admin::save_mysql_users_runtime_to_database(bool _runtime) {
 	account_details_t **ads=NULL;
 	int num_users;
 	int i;
-	char *qf=(char *)"REPLACE INTO mysql_users(username,password,active,use_ssl,default_hostgroup,default_schema,schema_locked,transaction_persistent,fast_forward,backend,frontend,max_connections) VALUES(\"%s\",\"%s\",1,%d,%d,\"%s\",%d,%d,%d,COALESCE((SELECT backend FROM mysql_users WHERE username=\"%s\" AND frontend=1),0),1,%d)";
-	char *qb=(char *)"REPLACE INTO mysql_users(username,password,active,use_ssl,default_hostgroup,default_schema,schema_locked,transaction_persistent,fast_forward,backend,frontend,max_connections) VALUES(\"%s\",\"%s\",1,%d,%d,\"%s\",%d,%d,%d,1,COALESCE((SELECT frontend FROM mysql_users WHERE username=\"%s\" AND backend=1),0),%d)";
-	char *qfr=(char *)"REPLACE INTO runtime_mysql_users(username,password,active,use_ssl,default_hostgroup,default_schema,schema_locked,transaction_persistent,fast_forward,backend,frontend,max_connections) VALUES(\"%s\",\"%s\",1,%d,%d,\"%s\",%d,%d,%d,COALESCE((SELECT backend FROM runtime_mysql_users WHERE username=\"%s\" AND frontend=1),0),1,%d)";
-	char *qbr=(char *)"REPLACE INTO runtime_mysql_users(username,password,active,use_ssl,default_hostgroup,default_schema,schema_locked,transaction_persistent,fast_forward,backend,frontend,max_connections) VALUES(\"%s\",\"%s\",1,%d,%d,\"%s\",%d,%d,%d,1,COALESCE((SELECT frontend FROM runtime_mysql_users WHERE username=\"%s\" AND backend=1),0),%d)";
+	char *qf=(char *)"REPLACE INTO mysql_users(username,password,active,use_ssl,default_hostgroup,default_schema,schema_locked,transaction_persistent,fast_forward,backend,frontend,max_connections) VALUES('%s','%s',1,%d,%d,'%s',%d,%d,%d,COALESCE((SELECT backend FROM mysql_users WHERE username='%s' AND frontend=1),0),1,%d)";
+	char *qb=(char *)"REPLACE INTO mysql_users(username,password,active,use_ssl,default_hostgroup,default_schema,schema_locked,transaction_persistent,fast_forward,backend,frontend,max_connections) VALUES('%s','%s',1,%d,%d,'%s',%d,%d,%d,1,COALESCE((SELECT frontend FROM mysql_users WHERE username='%s' AND backend=1),0),%d)";
+	char *qfr=(char *)"REPLACE INTO runtime_mysql_users(username,password,active,use_ssl,default_hostgroup,default_schema,schema_locked,transaction_persistent,fast_forward,backend,frontend,max_connections) VALUES('%s','%s',1,%d,%d,'%s',%d,%d,%d,COALESCE((SELECT backend FROM runtime_mysql_users WHERE username='%s' AND frontend=1),0),1,%d)";
+	char *qbr=(char *)"REPLACE INTO runtime_mysql_users(username,password,active,use_ssl,default_hostgroup,default_schema,schema_locked,transaction_persistent,fast_forward,backend,frontend,max_connections) VALUES('%s','%s',1,%d,%d,'%s',%d,%d,%d,1,COALESCE((SELECT frontend FROM runtime_mysql_users WHERE username='%s' AND backend=1),0),%d)";
 	num_users=GloMyAuth->dump_all_users(&ads);
 	if (num_users==0) return;
 	for (i=0; i<num_users; i++) {
@@ -3979,7 +3979,7 @@ void ProxySQL_Admin::stats___mysql_users() {
 	int num_users;
 	int i;
 	statsdb->execute("DELETE FROM stats_mysql_users");
-	char *q=(char *)"INSERT INTO stats_mysql_users(username,frontend_connections,frontend_max_connections) VALUES (\"%s\",%d,%d)";
+	char *q=(char *)"INSERT INTO stats_mysql_users(username,frontend_connections,frontend_max_connections) VALUES ('%s',%d,%d)";
 	int l=strlen(q);
 	char buf[256];
 	num_users=GloMyAuth->dump_all_users(&ads, false);
@@ -4376,7 +4376,7 @@ int ProxySQL_Admin::Read_MySQL_Users_from_configfile() {
 	int i;
 	int rows=0;
 	admindb->execute("PRAGMA foreign_keys = OFF");
-	char *q=(char *)"INSERT OR REPLACE INTO mysql_users (username, password, active, default_hostgroup, default_schema, schema_locked, transaction_persistent, fast_forward, max_connections) VALUES (\"%s\", \"%s\", %d, %d, \"%s\", %d, %d, %d, %d)";
+	char *q=(char *)"INSERT OR REPLACE INTO mysql_users (username, password, active, default_hostgroup, default_schema, schema_locked, transaction_persistent, fast_forward, max_connections) VALUES ('%s', '%s', %d, %d, '%s', %d, %d, %d, %d)";
 	for (i=0; i< count; i++) {
 		const Setting &user = mysql_users[i];
 		std::string username;