diff --git a/.github/scripts/tag.sh b/.github/scripts/tag.sh
index 1534d63..e6c66eb 100755
--- a/.github/scripts/tag.sh
+++ b/.github/scripts/tag.sh
@@ -4,7 +4,7 @@ set -e
 
 head_tag=$(git describe --exact-match 2>/dev/null || true)
 
-if [[ ${head_tag} =~ [\d{2}.\d{2}.\d+] ]]
+if [[ ${head_tag} =~ [\d{2}\.\d{2}\.\d+] ]]
 then
     echo "Current master already has version tag ${head_tag}"
 else