diff --git a/packaging/cli-migrations/v2/docker-entrypoint.sh b/packaging/cli-migrations/v2/docker-entrypoint.sh
index c38f2cb76f4..81548b240f2 100755
--- a/packaging/cli-migrations/v2/docker-entrypoint.sh
+++ b/packaging/cli-migrations/v2/docker-entrypoint.sh
@@ -38,7 +38,7 @@ fi
 
 # wait for a port to be ready
 wait_for_port() {
-    PORT=$1
+    local PORT=$1
     log "migrations-startup" "waiting $HASURA_GRAPHQL_MIGRATIONS_SERVER_TIMEOUT for $PORT to be ready"
     for _ in $(seq 1 $HASURA_GRAPHQL_MIGRATIONS_SERVER_TIMEOUT);
     do
diff --git a/packaging/cli-migrations/v3/docker-entrypoint.sh b/packaging/cli-migrations/v3/docker-entrypoint.sh
index 0e79d611f7f..6c8ad6fd9dc 100755
--- a/packaging/cli-migrations/v3/docker-entrypoint.sh
+++ b/packaging/cli-migrations/v3/docker-entrypoint.sh
@@ -34,7 +34,7 @@ fi
 
 # wait for a port to be ready
 wait_for_port() {
-    PORT=$1
+    local PORT=$1
     log "migrations-startup" "waiting $HASURA_GRAPHQL_MIGRATIONS_SERVER_TIMEOUT for $PORT to be ready"
     for _ in $(seq 1 $HASURA_GRAPHQL_MIGRATIONS_SERVER_TIMEOUT);
     do