diff --git a/db/zm_update-1.37.48.sql b/db/zm_update-1.37.48.sql
index a42a3d4f5..b7d1df730 100644
--- a/db/zm_update-1.37.48.sql
+++ b/db/zm_update-1.37.48.sql
@@ -38,9 +38,9 @@ SET @s = (SELECT IF(
  "ALTER TABLE `Monitors`
  ADD COLUMN  `FloorplanX` INT NOT NULL default '0' AFTER `Longitude`,
  ADD COLUMN  `FloorplanY` INT NOT NULL default '0' AFTER `FloorplanX`,
- ADD COLUMN  `FloorplanID` INT(10) default NULL AFTER `FloorplanY`,
+ ADD COLUMN  `FloorplanID` INT(10) UNSIGNED default NULL AFTER `FloorplanY`,
  ADD COLUMN  `FloorplanPoint` SMALLINT NOT NULL default '0' AFTER `FloorplanID`,
- ADD FOREIGN KEY `FloorplanID` REFERENCES Floorplans(`id`) ON DELETE SET NULL"
+ ADD FOREIGN KEY (`FloorplanID`) REFERENCES Floorplans(`id`) ON DELETE SET NULL"
 ));
 
 PREPARE stmt FROM @s;