diff --git a/src/timeshift/timeshift_filemgr.c b/src/timeshift/timeshift_filemgr.c
index ee6ebcc9..d33be281 100644
--- a/src/timeshift/timeshift_filemgr.c
+++ b/src/timeshift/timeshift_filemgr.c
@@ -73,6 +73,8 @@ static void* timeshift_reaper_callback ( void *p )
         tvhlog(LOG_ERR, "timeshift", "failed to remove %s [e=%s]",
                dpath, strerror(errno));
 
+    pthread_mutex_lock(&timeshift_reaper_lock);
+
     /* Free memory */
     while ((ti = TAILQ_FIRST(&tsf->iframes))) {
       TAILQ_REMOVE(&tsf->iframes, ti, link);