diff --git a/src/server/distrenjob.h b/src/server/distrenjob.h
--- a/src/server/distrenjob.h
+++ b/src/server/distrenjob.h
@@ -45,6 +45,7 @@ struct distrenjob {
   int total_frames; // how many frames are in the animation for stats/etc (unassigned frames)
   int watchdog_forgiveness; // how many seconds till the frame is re-assigned (if client computer crashes etc);
   short int hibernate;
+  int prev_frame_index; // the position in the array of the last frame that was assigned
   time_t total_render_time; // total seconds of time spent on all the completed frames
   char *output_format; /*< currently is the file extention of the request output format. @todo make this mime-type based/not a string */
   struct frameset *frameset;