diff --git a/mysql-test/suite/roles/create_and_drop_role.result b/mysql-test/suite/roles/create_and_drop_role.result
index d565b888c5f..13631f935bf 100644
--- a/mysql-test/suite/roles/create_and_drop_role.result
+++ b/mysql-test/suite/roles/create_and_drop_role.result
@@ -68,3 +68,19 @@ GRANT USAGE ON *.* TO 'r1'@'localhost'
 DROP USER u1;
 DROP ROLE r2;
 DROP USER r1@localhost;
+create role 'foo  ';
+select concat(user, '__'), is_role from mysql.user where user like 'foo%';
+concat(user, '__')	is_role
+foo__	Y
+select * from mysql.roles_mapping;
+Host	User	Role	Admin_option
+localhost	root	foo	Y
+drop role foo;
+select concat(user, '__'), is_role from mysql.user where user like 'foo%';
+concat(user, '__')	is_role
+select * from mysql.roles_mapping;
+Host	User	Role	Admin_option
+show grants;
+Grants for root@localhost
+GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION
+GRANT PROXY ON ''@'%' TO 'root'@'localhost' WITH GRANT OPTION
diff --git a/mysql-test/suite/roles/create_and_drop_role.test b/mysql-test/suite/roles/create_and_drop_role.test
index 71d6de7053f..b6e5bd2b297 100644
--- a/mysql-test/suite/roles/create_and_drop_role.test
+++ b/mysql-test/suite/roles/create_and_drop_role.test
@@ -95,3 +95,15 @@ SHOW GRANTS FOR r1@localhost; # Related to MDEV-7774, also caused a crash, by
 DROP USER u1;
 DROP ROLE r2;
 DROP USER r1@localhost;
+
+#
+# MDEV-11533: Roles with trailing white spaces are not cleared correctly
+#
+create role 'foo  ';
+select concat(user, '__'), is_role from mysql.user where user like 'foo%';
+select * from mysql.roles_mapping;
+drop role foo;
+select concat(user, '__'), is_role from mysql.user where user like 'foo%';
+select * from mysql.roles_mapping;
+--sorted_result
+show grants;
diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index c1cd2a94130..c9fd000141a 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -15178,6 +15178,7 @@ grant_role:
             CHARSET_INFO *cs= system_charset_info;
             /* trim end spaces (as they'll be lost in mysql.user anyway) */
             $1.length= cs->cset->lengthsp(cs, $1.str, $1.length);
+            $1.str[$1.length] = '\0';
             if ($1.length == 0)
             {
               my_error(ER_INVALID_ROLE, MYF(0), "");