diff --git a/build.sh b/build.sh
index e1943bb..ebdf890 100755
--- a/build.sh
+++ b/build.sh
@@ -13,7 +13,10 @@ cat <<EOF > /kaniko/.docker/config.json
 }
 EOF
 
-[ -z "$IMAGEAPP" ] && IMAGEAPP="$${REGISTRY#*://}/$INPUT_IMAGE"
+if [ -z "$IMAGEAPP" ]; then
+    REGISTRY="$(echo "$GITHUB_SERVER_URL" | sed 's .*://  ')"
+    IMAGEAPP="$REGISTRY/$INPUT_IMAGE"
+fi
 
 /kaniko/executor \
     --cache="${INPUT_CACHE}" \