diff --git a/mod/wiki/db/postgres7.php b/mod/wiki/db/postgres7.php
index 269b5b51100..647d8891dd5 100644
--- a/mod/wiki/db/postgres7.php
+++ b/mod/wiki/db/postgres7.php
@@ -45,6 +45,14 @@ function wiki_upgrade($oldversion) {
         modify_database('','CREATE INDEX prefix_wiki_entries_course_idx ON prefix_wiki_entries (course);');
         modify_database('','CREATE INDEX prefix_wiki_entries_pagename_idx ON prefix_wiki_entries (pagename);');
     }
+
+    if ($oldversion < 2004083125) {
+        execute_sql("ALTER TABLE {$CFG->prefix}wiki_pages DROP CONSTRAINT id;",false);
+        execute_sql("ALTER TABLE {$CFG->prefix}wiki_pages DROP CONSTRAINT {$CFG->prefix}wiki_pages_id;",false);
+        execute_sql("ALTER TABLE {$CFG->prefix}wiki_pages DROP CONSTRAINT {$CFG->prefix}wiki_pages_pagename_version_wiki_unique;",false);
+        modify_database("", "ALTER TABLE ONLY prefix_wiki_pages
+                            ADD CONSTRAINT prefix_wiki_pages_pagename_version_wiki_unique PRIMARY KEY (pagename, \"version\", wiki);");
+    }
     
     return true;
 }
diff --git a/mod/wiki/version.php b/mod/wiki/version.php
index 3eb494399cc..0a6fc06ba43 100644
--- a/mod/wiki/version.php
+++ b/mod/wiki/version.php
@@ -5,8 +5,8 @@
 ///  This fragment is called by moodle_needs_upgrading() and /admin/index.php
 /////////////////////////////////////////////////////////////////////////////////
 
-$module->version  = 2004083124;  // The current module version (Date: YYYYMMDDXX)
-$module->requires = 2004083123;  // Requires this Moodle version
+$module->version  = 2004083125;  // The current module version (Date: YYYYMMDDXX)
+$module->requires = 2004083129;  // Requires this Moodle version
 $module->cron     = 0;           // Period for cron to check this module (secs)
 
 ?>