diff --git a/winbox_version.sh b/winbox_version.sh
index e50a226..a8e7115 100755
--- a/winbox_version.sh
+++ b/winbox_version.sh
@@ -1,9 +1,18 @@
 #!/bin/bash
 set -e
 
-WINBOX_URL="$(curl -s -L https://mt.lv/winbox64 -o /dev/null -w '%{url_effective}')"
-if [[ "${WINBOX_URL}" =~ /([0-9.]+)/ ]]; then
-    echo "${BASH_REMATCH[1]}.0"
+WINBOX_URL="$(curl -I -s -L https://mt.lv/winbox64 -o /dev/null -w '%{url_effective}')"
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  # grep -P doesn't exists on mac
+  version=$(echo $WINBOX_URL | perl -n -e'/\/(\d+\.\d+(?:\.\d+)?)(?=\/[^\/]*$)/ && print $1')
+else
+  version=$(echo $WINBOX_URL | grep -oP '(?<=/)\d+\.\d+(\.\d+)?(?=/[^/]*$)')
+fi
+
+if [ -z "$version" ]; then
+  echo "No version number found !"
+  exit 1
 else
-    exit 1
+  echo ${version}.0
 fi