diff --git a/Duplicati/Library/Localization/MoLocalizationService.cs b/Duplicati/Library/Localization/MoLocalizationService.cs
index d014893e9..7cf58ae27 100644
--- a/Duplicati/Library/Localization/MoLocalizationService.cs
+++ b/Duplicati/Library/Localization/MoLocalizationService.cs
@@ -74,7 +74,7 @@ namespace Duplicati.Library.Localization
                 // Load the specialized version first
                 string.Format("localization-{0}.mo", ci.Name), 
                 // Then try the generic language version
-                string.Format("localization-{0}.mo", ci.TwoLetterISOLanguageName) 
+                string.Format("localization-{0}.mo", ci.TwoLetterISOLanguageName.Replace('-', '_')) 
             };
 
             foreach(var fn in filenames)