diff --git a/Refit/UniqueName.cs b/Refit/UniqueName.cs
index 0fc7e85f9..fafb23acc 100644
--- a/Refit/UniqueName.cs
+++ b/Refit/UniqueName.cs
@@ -39,7 +39,7 @@ public static string ForType(Type refitInterfaceType)
             interfaceTypeName = interfaceTypeName.Replace("+", "");
 
             // Get the namespace and remove the dots
-            var ns = refitInterfaceType.Namespace?.Replace(".", "");
+            var ns = refitInterfaceType.Namespace?.Replace(".", "").Replace("-", "_");
 
             // Refit types will be generated as private classes within a Generated type in namespace
             // Refit.Implementation