diff --git a/src/or/hibernate.c b/src/or/hibernate.c
index d7968f721a..054511084c 100644
--- a/src/or/hibernate.c
+++ b/src/or/hibernate.c
@@ -542,7 +542,7 @@ accounting_record_bandwidth_usage(time_t now, or_state_t *state)
   char time2[ISO_TIME_LEN+1];
   char *cp = buf;
   time_t tmp;
-  int r;
+  int r = 0;
   uint64_t expected;
   static time_t last_recorded;