diff --git a/bin/m b/bin/m
index a0e279e..ca08fe1 100755
--- a/bin/m
+++ b/bin/m
@@ -1503,7 +1503,7 @@ get_latest_installed_version() {
       ;;
   esac
 
-  if [[ $version =~ ^([0-9)]\.([0-9]+)(-ent)?$ ]]; then
+  if [[ $version =~ ^([0-9]+)\.([0-9]+)(-ent)?$ ]]; then
     local series="${BASH_REMATCH[1]}\.${BASH_REMATCH[2]}"
     local ent="${BASH_REMATCH[3]}"
     version=`find ${VERSIONS_DIR} -mindepth 1 -maxdepth 1 -type d \