diff --git a/mod/quiz/db/mysql.php b/mod/quiz/db/mysql.php
index 591bd5cceb6..1ff0ec95714 100644
--- a/mod/quiz/db/mysql.php
+++ b/mod/quiz/db/mysql.php
@@ -298,8 +298,8 @@ function quiz_upgrade($oldversion) {
     }
 
     if ($oldversion < 2005010201) {
-        table_column('quiz_categories', '', 'parent');
-        table_column('quiz_categories', '', 'sortorder', '', '', '', '999');
+        table_column('quiz_categories', '', 'parent', 'integer');
+        table_column('quiz_categories', '', 'sortorder', 'integer', '', '', '999');
     }
 
     if ($oldversion < 2005010300) {
diff --git a/mod/quiz/db/postgres7.php b/mod/quiz/db/postgres7.php
index ec013e6a49f..d34fcb4d382 100644
--- a/mod/quiz/db/postgres7.php
+++ b/mod/quiz/db/postgres7.php
@@ -283,8 +283,8 @@ function quiz_upgrade($oldversion) {
     }
 
     if ($oldversion < 2005010201) {
-        table_column('quiz_categories', '', 'parent');
-        table_column('quiz_categories', '', 'sortorder', '', '', '', '999');
+        table_column('quiz_categories', '', 'parent', 'integer');
+        table_column('quiz_categories', '', 'sortorder', 'integer', '', '', '999');
     }
 
     if ($oldversion < 2005010300) {