diff --git a/controllers/utils/isolated_network.go b/controllers/utils/isolated_network.go
index 9380bd60..c7fd44d7 100644
--- a/controllers/utils/isolated_network.go
+++ b/controllers/utils/isolated_network.go
@@ -25,14 +25,14 @@ import (
 )
 
 func (r *ReconciliationRunner) IsoNetMetaName(name string) string {
-	return fmt.Sprintf("%s-%s", r.CSCluster.Name, strings.ToLower(name))
+	return strings.ReplaceAll(fmt.Sprintf("%s-%s", r.CSCluster.Name, strings.ToLower(name)), "_", "-")
 }
 
 // GenerateIsolatedNetwork of the passed name that's owned by the ReconciliationSubject.
 func (r *ReconciliationRunner) GenerateIsolatedNetwork(name string, fdNameFunc func() string) CloudStackReconcilerMethod {
 	return func() (ctrl.Result, error) {
 		lowerName := strings.ToLower(name)
-		metaName := fmt.Sprintf("%s-%s", r.CSCluster.Name, lowerName)
+		metaName := r.IsoNetMetaName(lowerName)
 		csIsoNet := &infrav1.CloudStackIsolatedNetwork{}
 		csIsoNet.ObjectMeta = r.NewChildObjectMeta(metaName)
 		csIsoNet.Spec.Name = lowerName