diff --git a/internal/firewall_rule/firewall_rule_resource.go b/internal/firewall_rule/firewall_rule_resource.go
index ed56e13..db59805 100644
--- a/internal/firewall_rule/firewall_rule_resource.go
+++ b/internal/firewall_rule/firewall_rule_resource.go
@@ -11,7 +11,6 @@ import (
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringplanmodifier"
 	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
 	"github.com/hashicorp/terraform-plugin-framework/types"
-	"strings"
 
 	swagger "github.com/crusoecloud/client-go/swagger/v1alpha4"
 	"github.com/crusoecloud/terraform-provider-crusoe/internal/common"