Index: mod/assignment/lib.php
===================================================================
--- mod/assignment/lib.php	(revision 268)
+++ mod/assignment/lib.php	(working copy)
@@ -2256,7 +2256,7 @@
     global $CFG;
 
     if ($groupid) {     /// How many in a particular group?
-        return count_records_sql("SELECT COUNT(DISTINCT gm.userid, gm.groupid)
+        return count_records_sql("SELECT COUNT(*)
                                      FROM {$CFG->prefix}assignment_submissions a,
                                           ".groups_members_from_sql()."
                                     WHERE a.assignment = $assignment->id