diff --git a/docker/images/n8n-custom/Dockerfile b/docker/images/n8n-custom/Dockerfile
index 6e1f1d210a..19897a91a0 100644
--- a/docker/images/n8n-custom/Dockerfile
+++ b/docker/images/n8n-custom/Dockerfile
@@ -32,7 +32,7 @@ COPY --from=builder /compiled /usr/local/lib/node_modules/n8n
 COPY docker/images/n8n/docker-entrypoint.sh /
 
 # Setup the Task Runner Launcher
-ARG TARGETPLATFORM
+ARG TARGETPLATFORM="linux/amd64"
 ARG LAUNCHER_VERSION=1.1.0
 COPY docker/images/n8n/n8n-task-runners.json /etc/n8n-task-runners.json
 # Download, verify, then extract the launcher binary