diff --git a/sql/events.cc b/sql/events.cc
index ad98e257f79..b007d73833b 100644
--- a/sql/events.cc
+++ b/sql/events.cc
@@ -768,7 +768,8 @@ Events::fill_schema_events(THD *thd, TABLE_LIST *tables, COND * /* cond */)
   if (thd->lex->sql_command == SQLCOM_SHOW_EVENTS)
   {
     DBUG_ASSERT(thd->lex->select_lex.db);
-    if (!is_infoschema_db(thd->lex->select_lex.db) &&  // There is no events in I_S
+    if (!is_infoschema_db(thd->lex->select_lex.db,    // There is no events in I_S
+                          strlen(thd->lex->select_lex.db)) &&
         check_access(thd, EVENT_ACL, thd->lex->select_lex.db,
                      NULL, NULL, 0, 0))
       DBUG_RETURN(1);
diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index 4d5490e8219..30bec7a6b54 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -1439,8 +1439,12 @@ bool get_schema_tables_result(JOIN *join,
                               enum enum_schema_table_state executed_place);
 enum enum_schema_tables get_schema_table_idx(ST_SCHEMA_TABLE *schema_table);
 
-#define is_infoschema_db(X) \
-  !my_strcasecmp(system_charset_info, INFORMATION_SCHEMA_NAME.str, (X))
+inline bool is_infoschema_db(const char *name, size_t len)
+{
+  return (INFORMATION_SCHEMA_NAME.length == len &&
+          !my_strcasecmp(system_charset_info,
+                         INFORMATION_SCHEMA_NAME.str, name));
+}
 
 void initialize_information_schema_acl();
 
diff --git a/sql/sql_db.cc b/sql/sql_db.cc
index 9fef7114898..fe38afb0521 100644
--- a/sql/sql_db.cc
+++ b/sql/sql_db.cc
@@ -645,7 +645,7 @@ int mysql_create_db(THD *thd, char *db, HA_CREATE_INFO *create_info,
   DBUG_ENTER("mysql_create_db");
 
   /* do not create 'information_schema' db */
-  if (!my_strcasecmp(system_charset_info, db, INFORMATION_SCHEMA_NAME.str))
+  if (is_infoschema_db(db, strlen(db)))
   {
     my_error(ER_DB_CREATE_EXISTS, MYF(0), db);
     DBUG_RETURN(-1);
@@ -1600,8 +1600,7 @@ bool mysql_change_db(THD *thd, const LEX_STRING *new_db_name, bool force_switch)
     }
   }
 
-  if (my_strcasecmp(system_charset_info, new_db_name->str,
-                    INFORMATION_SCHEMA_NAME.str) == 0)
+  if (is_infoschema_db(new_db_name->str, new_db_name->length))
   {
     /* Switch the current database to INFORMATION_SCHEMA. */
 
diff --git a/sql/table.cc b/sql/table.cc
index c0c365f4901..3e2e5adc2c7 100644
--- a/sql/table.cc
+++ b/sql/table.cc
@@ -215,10 +215,7 @@ TABLE_CATEGORY get_table_category(const LEX_STRING *db, const LEX_STRING *name)
   DBUG_ASSERT(db != NULL);
   DBUG_ASSERT(name != NULL);
 
-  if ((db->length == INFORMATION_SCHEMA_NAME.length) &&
-      (my_strcasecmp(system_charset_info,
-                     INFORMATION_SCHEMA_NAME.str,
-                     db->str) == 0))
+  if (is_infoschema_db(db->str, db->length))
     return TABLE_CATEGORY_INFORMATION;
 
   if ((db->length == PERFORMANCE_SCHEMA_DB_NAME.length) &&
@@ -3941,7 +3938,8 @@ const char *Natural_join_column::db_name()
   DBUG_ASSERT(!strcmp(table_ref->db,
                       table_ref->table->s->db.str) ||
               (table_ref->schema_table &&
-               is_infoschema_db(table_ref->table->s->db.str)));
+               is_infoschema_db(table_ref->table->s->db.str,
+                                table_ref->table->s->db.length)));
   return table_ref->db;
 }
 
@@ -4159,7 +4157,8 @@ const char *Field_iterator_table_ref::get_db_name()
   */
   DBUG_ASSERT(!strcmp(table_ref->db, table_ref->table->s->db.str) ||
               (table_ref->schema_table &&
-               is_infoschema_db(table_ref->table->s->db.str)));
+               is_infoschema_db(table_ref->table->s->db.str,
+                                table_ref->table->s->db.length)));
 
   return table_ref->db;
 }