diff --git a/entrypoint.sh b/entrypoint.sh
index fb6f95a..86c6e3d 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -15,7 +15,7 @@ EOF
 
 if [ -z "$IMAGEAPP" ]; then
     REGISTRY="$(echo "$GITHUB_SERVER_URL" | sed 's .*://  ')"
-    IMAGEAPP="$REGISTRY/$(printf '%s' "$INPUT_IMAGE" | tr '[:upper:]' '[:lower:]' | tr -c '[:lower:][:digit:]-:_' _)"
+    IMAGEAPP="$REGISTRY/$(printf '%s' "$INPUT_IMAGE" | tr '[:upper:]' '[:lower:]' | tr -c '[:lower:][:digit:]-/:_' _)"
 fi
 
 /kaniko/executor \