diff --git a/model/cubes/dimcustomer.yml b/model/cubes/dimcustomer.yml
index 56402c2..6a9d80c 100644
--- a/model/cubes/dimcustomer.yml
+++ b/model/cubes/dimcustomer.yml
@@ -18,7 +18,7 @@ cubes:
         sql: geographykey
         type: number
 
-      - name: firstname
+      - name: firstname_f
         sql: firstname
         type: string