diff --git a/migrations/V11__add_function_for_storing_user_details.sql b/migrations/V11__add_function_for_storing_user_details.sql
index a1763b9..21b03d1 100644
--- a/migrations/V11__add_function_for_storing_user_details.sql
+++ b/migrations/V11__add_function_for_storing_user_details.sql
@@ -3,7 +3,8 @@ or replace function update_username_and_default_circle (
     p_user_id uuid,
     p_username text,
     p_default_circle_id int
-) returns void as $ $ DECLARE v_default_circle_exists boolean;
+) returns void as $$
+DECLARE v_default_circle_exists boolean;
 
 BEGIN -- Update username in kpi_user table
 UPDATE
@@ -54,4 +55,4 @@ where
 
 end;
 
-$ $ LANGUAGE plpgsql;
\ No newline at end of file
+$$ LANGUAGE plpgsql;
\ No newline at end of file
diff --git a/migrations/V13__add_column_created_by.sql b/migrations/V13__add_column_created_by.sql
index 744ad10..6b782bb 100644
--- a/migrations/V13__add_column_created_by.sql
+++ b/migrations/V13__add_column_created_by.sql
@@ -1,9 +1,15 @@
+ALTER TABLE
+    kpi_definition
+DROP
+    CONSTRAINT IF EXISTS fk_auth_user;
+
 ALTER TABLE
     kpi_definition
 ADD
     COLUMN IF NOT EXISTS created_by uuid;
 
+
 ALTER TABLE
     kpi_definition
 ADD
-    CONSTRAINT IF NOT EXISTS fk_auth_user FOREIGN KEY (created_by) REFERENCES auth.users (id);
\ No newline at end of file
+    CONSTRAINT fk_auth_user FOREIGN KEY (created_by) REFERENCES auth.users (id);
\ No newline at end of file