diff --git a/plugin/wakatime.vim b/plugin/wakatime.vim
index c6ece12..229daef 100644
--- a/plugin/wakatime.vim
+++ b/plugin/wakatime.vim
@@ -236,6 +236,7 @@ let s:VERSION = '4.0.15'
 
     function! s:SendHeartbeats()
         if len(s:heartbeats_buffer) == 0
+            let s:last_sent = localtime()
             return
         endif