diff --git a/lib/capture/sp-capture-writer.c b/lib/capture/sp-capture-writer.c
index a1fa2205..8ccc5342 100644
--- a/lib/capture/sp-capture-writer.c
+++ b/lib/capture/sp-capture-writer.c
@@ -1120,6 +1120,8 @@ sp_capture_writer_set_counters (SpCaptureWriter             *self,
   if (!set)
     return FALSE;
 
+  memset (set, 0, len);
+
   sp_capture_writer_frame_init (&set->frame,
                                 len,
                                 cpu,