diff --git a/schema/deploy/mutations/commit_form_change_internal.sql b/schema/deploy/mutations/commit_form_change_internal.sql
index 1c0d40ca91..f017474906 100644
--- a/schema/deploy/mutations/commit_form_change_internal.sql
+++ b/schema/deploy/mutations/commit_form_change_internal.sql
@@ -1,6 +1,8 @@
 -- Deploy cif:mutations/commit_form_change to pg
 begin;
 
+-- We need to explicitly drop the old function here since we're changing the signature.
+drop function cif_private.commit_form_change_internal(cif.form_change);
 create or replace function cif_private.commit_form_change_internal(fc cif.form_change, pending_project_revision_id int)
     returns cif.form_change as $$
 declare