diff --git a/install.sh b/install.sh
index 8141b3f..7f6ce83 100755
--- a/install.sh
+++ b/install.sh
@@ -377,6 +377,12 @@ wait_for_compose_health() {
 }
 
 docker compose --env-file "$ENV_FILE" -f "$E_COMPOSE" -p "$E_PROJECT" up -d postgres valkey
+# A previous interrupted install may have initialized the volume with a
+# different generated role password. Reconcile it through the local Postgres
+# socket before running migrations; no data is dropped.
+docker compose --env-file "$ENV_FILE" -f "$E_COMPOSE" -p "$E_PROJECT" exec -T postgres \
+  psql -U postgres -d postgres -v ON_ERROR_STOP=1 \
+  -c "ALTER ROLE product_e WITH PASSWORD '$E_POSTGRES_PASSWORD';" >/dev/null
 docker compose --env-file "$ENV_FILE" -f "$E_COMPOSE" -p "$E_PROJECT" run --rm --no-deps e-server migrate -config /etc/overcooked-e/config.yaml
 docker compose --env-file "$ENV_FILE" -f "$S_COMPOSE" -p "$S_PROJECT" up -d postgres valkey
 docker compose --env-file "$ENV_FILE" -f "$S_COMPOSE" -p "$S_PROJECT" run --rm --no-deps s-migrate