diff --git a/internal/pkg/container/vnfs.go b/internal/pkg/container/vnfs.go
index 731f67cb..a9effc37 100644
--- a/internal/pkg/container/vnfs.go
+++ b/internal/pkg/container/vnfs.go
@@ -12,7 +12,7 @@ import (
 )
 
 func ValidName(name string) bool {
-	if util.ValidString(name, "^[a-zA-Z0-9.:-]+$") == false {
+	if util.ValidString(name, "^[a-zA-Z0-9.:-_]+$") == false {
 		wwlog.Printf(wwlog.WARN, "VNFS name has illegal characters: %s\n", name)
 		return false
 	}