diff --git a/mysql-test/suite/innodb/r/innodb-use-sys-malloc.result b/mysql-test/suite/innodb/r/innodb-use-sys-malloc.result
new file mode 100644
index 00000000000..2ec4c7c8130
--- /dev/null
+++ b/mysql-test/suite/innodb/r/innodb-use-sys-malloc.result
@@ -0,0 +1,48 @@
+SELECT @@GLOBAL.innodb_use_sys_malloc;
+@@GLOBAL.innodb_use_sys_malloc
+1
+1 Expected
+SET @@GLOBAL.innodb_use_sys_malloc=0;
+ERROR HY000: Variable 'innodb_use_sys_malloc' is a read only variable
+Expected error 'Read only variable'
+SELECT @@GLOBAL.innodb_use_sys_malloc;
+@@GLOBAL.innodb_use_sys_malloc
+1
+1 Expected
+drop table if exists t1;
+create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
+insert into t1 values (1),(2),(3),(4),(5),(6),(7);
+select * from t1;
+a
+1
+2
+3
+4
+5
+6
+7
+drop table t1;
+SELECT @@GLOBAL.innodb_use_sys_malloc;
+@@GLOBAL.innodb_use_sys_malloc
+1
+1 Expected
+SET @@GLOBAL.innodb_use_sys_malloc=0;
+ERROR HY000: Variable 'innodb_use_sys_malloc' is a read only variable
+Expected error 'Read only variable'
+SELECT @@GLOBAL.innodb_use_sys_malloc;
+@@GLOBAL.innodb_use_sys_malloc
+1
+1 Expected
+drop table if exists t1;
+create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
+insert into t1 values (1),(2),(3),(4),(5),(6),(7);
+select * from t1;
+a
+1
+2
+3
+4
+5
+6
+7
+drop table t1;
diff --git a/storage/pbxt/src/ha_pbxt.cc b/storage/pbxt/src/ha_pbxt.cc
index 0a76239b177..e8ce200ce0f 100644
--- a/storage/pbxt/src/ha_pbxt.cc
+++ b/storage/pbxt/src/ha_pbxt.cc
@@ -1250,7 +1250,7 @@ static int pbxt_init(void *p)
 				 * Only real problem, 2 threads try to load the same
 				 * plugin at the same time.
 				 */
-#if MYSQL_VERSION_ID < 60014 && (!defined(MARIADB_BASE_VERSION) || MYSQL_VERSION_ID < 50146)
+#if MYSQL_VERSION_ID <= 50146
 				myxt_mutex_unlock(&LOCK_plugin);
 #endif
 #endif
@@ -1286,10 +1286,8 @@ static int pbxt_init(void *p)
 
 				if (thd)
 					myxt_destroy_thread(thd, FALSE);
-#ifndef DRIZZLED
-#if MYSQL_VERSION_ID < 60014 && (!defined(MARIADB_BASE_VERSION) || MYSQL_VERSION_ID < 50146)
+#if MYSQL_VERSION_ID <= 50146 && !defined(DRIZZLED)
 				myxt_mutex_lock(&LOCK_plugin);
-#endif
 #endif
 			}
 #endif