diff --git a/src/Mercurial.Net/ClientExecutable.cs b/src/Mercurial.Net/ClientExecutable.cs
old mode 100644
new mode 100755
index 7e11ca0..206dc12
--- a/src/Mercurial.Net/ClientExecutable.cs
+++ b/src/Mercurial.Net/ClientExecutable.cs
@@ -238,7 +238,7 @@ private static Version DoGetVersion()
                 {
                     '\n', '\r'
                 }, StringSplitOptions.RemoveEmptyEntries).First();
-            var re = new Regex(@"\(version\s+(?<version>[0-9.]+)(\+\d+-[a-f0-9]+)?\)", RegexOptions.IgnoreCase);
+            var re = new Regex(@"\(version\s+(?<version>[0-9.]+)(?:(?:\+\d+-[a-f0-9]+)|(?:rc\d+))?\)", RegexOptions.IgnoreCase);
             Match ma = re.Match(firstLine);
             if (!ma.Success)
                 throw new InvalidOperationException(