diff --git a/Duplicati/Library/Utility/Uri.cs b/Duplicati/Library/Utility/Uri.cs
index 39c666369..6c5569cee 100644
--- a/Duplicati/Library/Utility/Uri.cs
+++ b/Duplicati/Library/Utility/Uri.cs
@@ -353,7 +353,7 @@ namespace Duplicati.Library.Utility
         /// <summary>
         /// The regular expression that matches %20 type values in a querystring
         /// </summary>
-        private static readonly System.Text.RegularExpressions.Regex RE_ESCAPECHAR = new System.Text.RegularExpressions.Regex(@"[^0-9a-zA-Z\-_]", System.Text.RegularExpressions.RegexOptions.Compiled);
+        private static readonly System.Text.RegularExpressions.Regex RE_ESCAPECHAR = new System.Text.RegularExpressions.Regex(@"[^0-9a-zA-Z\-_.]", System.Text.RegularExpressions.RegexOptions.Compiled);
 
         /// <summary>
         /// Encodes a URL, like System.Web.HttpUtility.UrlEncode