diff --git a/SabreTools.RedumpLib/Tools/Builder.cs b/SabreTools.RedumpLib/Tools/Builder.cs
index 32e50f0..f4e8fde 100644
--- a/SabreTools.RedumpLib/Tools/Builder.cs
+++ b/SabreTools.RedumpLib/Tools/Builder.cs
@@ -172,7 +172,7 @@ namespace SabreTools.RedumpLib.Tools
             }
 
             // Version
-            if (info.DiscIdentifiers.Version is null)
+            if (string.IsNullOrEmpty(info.DiscIdentifiers.Version))
             {
                 match = Constants.VersionRegex.Match(discData);
                 if (match.Success)