diff --git a/btrbk-cron b/btrbk-cron
index c96fab6..4d7c865 100755
--- a/btrbk-cron
+++ b/btrbk-cron
@@ -1,6 +1,7 @@
 #!/bin/bash
 
 CONF=/etc/btrbk/btrbk-cron.conf
+LOCKFILE=/run/btrbk/btrbk.lock
 LOGFILE=$(mktemp)
 trap 'rm -f -- "${LOGFILE}"' EXIT
 
@@ -29,6 +30,15 @@ else
   echo "Info: Healthchecks disabled"
 fi
 
+if [[ -f "${LOCKFILE}" ]] ; then
+  echo "Another instance is still running" | tee -a "${LOGFILE}"
+  if [[ "${HEALTHCHECK_ENABLE}" = "true" ]] ; then
+    curl "${CURLOPTS[@]}" --data-binary "@${LOGFILE}" "${HEALTHCHECK_URL}/log"
+  fi
+  rm -f -- "${LOGFILE}"
+  exit 0
+fi
+
 HOST=$(grep -E '^[\ \t]*target[\ \t]+send-receive' /etc/btrbk/btrbk.conf)
 # TODO: support for dashes in hostname and IPv6 ("[2001:db8::7]")
 HOST=$(echo "${HOST}" | sed -r 's/.*ssh:\/\/([0-9\.a-zA-Z]+).*/\1/g' )