diff --git a/.woodpecker.yml b/.woodpecker.yml
index dec625c..fa3247b 100644
--- a/.woodpecker.yml
+++ b/.woodpecker.yml
@@ -171,7 +171,8 @@ steps:
           
           echo "=== DEBUG: PROJECT_DIR='$PROJECT_DIR' PROJECT_NAME='$PROJECT_NAME' ==="
           
-          IMAGE_NAME="trent/${PROJECT_NAME,,}"
+          PROJECT_NAME_LOWER=$(echo "$PROJECT_NAME" | tr '[:upper:]' '[:lower:]')
+          IMAGE_NAME="trent/${PROJECT_NAME_LOWER}"
           FULL_IMAGE="git.modwad.pl/${IMAGE_NAME}"
           
           echo "=== DEBUG: IMAGE_NAME='$IMAGE_NAME' FULL_IMAGE='$FULL_IMAGE' ==="