diff --git a/SQL/0000-00-00-schema.sql b/SQL/0000-00-00-schema.sql
index d53201796c0..d685ef6fc8f 100644
--- a/SQL/0000-00-00-schema.sql
+++ b/SQL/0000-00-00-schema.sql
@@ -26,7 +26,7 @@ INSERT INTO subproject (title, useEDC, WindowDifference) VALUES
 CREATE TABLE `project_subproject_rel` (
   `ProjectSubprojectRelID` int(10) unsigned NOT NULL AUTO_INCREMENT,
   `ProjectID` int(2) NOT NULL,
-  `SubprojectID` int(2) NOT NULL,
+  `SubprojectID` int(10) unsigned NOT NULL,
   PRIMARY KEY (`ProjectSubprojectID`),
   CONSTRAINT `UK_project_subproject_rel_ProjectID_SubprojectID` UNIQUE KEY (ProjectID, SubprojectID),
   CONSTRAINT `FK_project_subproject_rel_ProjectID` FOREIGN KEY (`ProjectID`) REFERENCES `Project` (`ProjectID`) ON DELETE CASCADE,