diff --git a/Bugzilla/Constants.pm b/Bugzilla/Constants.pm
index f1c183e23..46512dec9 100644
--- a/Bugzilla/Constants.pm
+++ b/Bugzilla/Constants.pm
@@ -216,7 +216,7 @@ use Memoize;
 # BMO: we don't map exactly to a specific Bugzilla version, so override our
 # reported version with a parameter.
 sub BUGZILLA_VERSION {
-  my $bugzilla_version = '5.9.1';
+  my $bugzilla_version = '5.9.1+';
   eval { require Bugzilla }  || return $bugzilla_version;
   eval { Bugzilla->VERSION } || $bugzilla_version;
 }