diff --git a/sample-functions/DockerHubStats/Dockerfile b/sample-functions/DockerHubStats/Dockerfile
index 8e1924b9..55f759d8 100644
--- a/sample-functions/DockerHubStats/Dockerfile
+++ b/sample-functions/DockerHubStats/Dockerfile
@@ -12,5 +12,6 @@ ADD https://github.com/openfaas/faas/releases/download/0.6.0/fwatchdog /usr/bin
 RUN chmod +x /usr/bin/fwatchdog
 
 ENV fprocess "/go/bin/DockerHubStats"
+HEALTHCHECK --interval=5s CMD [ -e /tmp/.lock ] || exit 1
 
 CMD [ "/usr/bin/fwatchdog"]