diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index 78ac6e5b..85ca449a 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -7,7 +7,7 @@ use strict;
 use warnings;
 require v5.10;
 
-our $VERSION = "0.9.10";
+our $VERSION = "0.9.10b";
 
 our $debug = 0;
 sub debugf {