diff --git a/btrbk-cron b/btrbk-cron
index fe8d014..3b1615a 100755
--- a/btrbk-cron
+++ b/btrbk-cron
@@ -40,7 +40,7 @@ fi
 # lockfile check
 if [[ -f "${LOCKFILE}" ]] ; then
   # check if stale lockfile
-  if [[ $(pgrep -c btrbk || true) -eq 0 ]] ; then
+  if [[ $(pgrep --exact --count btrbk || true) -eq 0 ]] ; then
     echo "Removing stale lock file: ${LOCKFILE}"
     rm "${LOCKFILE}"
   else