diff --git a/pkg/apis/core/helper/helpers.go b/pkg/apis/core/helper/helpers.go
index 0c730aa6d52..4cdbae98002 100644
--- a/pkg/apis/core/helper/helpers.go
+++ b/pkg/apis/core/helper/helpers.go
@@ -175,7 +175,7 @@ func IsExtendedResourceName(name core.ResourceName) bool {
 	}
 	// Ensure it satisfies the rules in IsQualifiedName() after converted into quota resource name
 	nameForQuota := fmt.Sprintf("%s%s", core.DefaultResourceRequestsPrefix, string(name))
-	if errs := validation.IsQualifiedName(string(nameForQuota)); len(errs) != 0 {
+	if errs := validation.IsQualifiedName(nameForQuota); len(errs) != 0 {
 		return false
 	}
 	return true
diff --git a/pkg/apis/core/v1/helper/helpers.go b/pkg/apis/core/v1/helper/helpers.go
index fbc733d09cc..be33b1f94c7 100644
--- a/pkg/apis/core/v1/helper/helpers.go
+++ b/pkg/apis/core/v1/helper/helpers.go
@@ -39,7 +39,7 @@ func IsExtendedResourceName(name v1.ResourceName) bool {
 	}
 	// Ensure it satisfies the rules in IsQualifiedName() after converted into quota resource name
 	nameForQuota := fmt.Sprintf("%s%s", v1.DefaultResourceRequestsPrefix, string(name))
-	if errs := validation.IsQualifiedName(string(nameForQuota)); len(errs) != 0 {
+	if errs := validation.IsQualifiedName(nameForQuota); len(errs) != 0 {
 		return false
 	}
 	return true