diff --git a/src/rate_limit.c b/src/rate_limit.c
index 2facdc1..a2ad6ef 100644
--- a/src/rate_limit.c
+++ b/src/rate_limit.c
@@ -32,9 +32,9 @@ static void uc_ratelimit_refill(struct RateLimit *r, long current_ts)
     //Find elapsed time
     diff_period = current_ts - r->last_refill_ts;
 
-    if (diff_period > r->period + 1) {
-        //help prevent overflow when calculating available_tickets below
-        diff_period = r->period + 1;
+    if (diff_period > r->period) {
+        //help prevent overflow when calculating available tickets below
+        diff_period = r->period;
     } else if (diff_period < 0) {
         //time went backwards, skip this round
         diff_period = 0;