diff --git a/src/NzbDrone.Core/Download/Clients/Transmission/TransmissionBase.cs b/src/NzbDrone.Core/Download/Clients/Transmission/TransmissionBase.cs
index c430810cf9..2fb0eed188 100644
--- a/src/NzbDrone.Core/Download/Clients/Transmission/TransmissionBase.cs
+++ b/src/NzbDrone.Core/Download/Clients/Transmission/TransmissionBase.cs
@@ -234,7 +234,7 @@ protected override void Test(List<ValidationFailure> failures)
 
         protected virtual OsPath GetOutputPath(OsPath outputPath, TransmissionTorrent torrent)
         {
-            return outputPath + torrent.Name;
+            return outputPath + torrent.Name.Replace(":", "_");
         }
 
         protected string GetDownloadDirectory()