diff --git a/routeros/resource_ip_firewall_mangle.go b/routeros/resource_ip_firewall_mangle.go
index 82f2006c..d2664d09 100644
--- a/routeros/resource_ip_firewall_mangle.go
+++ b/routeros/resource_ip_firewall_mangle.go
@@ -102,7 +102,7 @@ func ResourceIPFirewallMangle() *schema.Resource {
 			Optional:    true,
 			Description: "Interprets the connection tracking analysis data for a particular packet.",
 			ValidateDiagFunc: ValidationMultiValInSlice([]string{
-				"estabilished", "invalid", "new", "related", "untracked",
+				"established", "invalid", "new", "related", "untracked",
 			}, false, true),
 		},
 		"connection_type": {