diff --git a/azurerm/internal/services/network/tests/resource_arm_application_gateway_test.go b/azurerm/internal/services/network/tests/resource_arm_application_gateway_test.go
index 8617b626e8c6..6db2927e5c24 100644
--- a/azurerm/internal/services/network/tests/resource_arm_application_gateway_test.go
+++ b/azurerm/internal/services/network/tests/resource_arm_application_gateway_test.go
@@ -1991,7 +1991,7 @@ resource "azurerm_web_application_firewall_policy" "testfwp" {
   }
 
   managed_rules {
-    managed_rules_set {
+    managed_rule_set {
       type    = "OWASP"
       version = "3.1"
     }