diff --git a/Containerfile b/Containerfile
index af436c1..1389b0f 100644
--- a/Containerfile
+++ b/Containerfile
@@ -13,6 +13,8 @@ COPY . .
 
 RUN echo "CONTAINER DEBUG: WEBMENTION_TOKEN length=${#WEBMENTION_TOKEN}"
 
+RUN node -e "console.log('NODE sees WEBMENTION_TOKEN length:', (process.env.WEBMENTION_TOKEN || '').length)"
+
 RUN npm run build