diff --git a/client.go b/client.go
index efee53c..0074763 100644
--- a/client.go
+++ b/client.go
@@ -552,7 +552,7 @@ func DefaultBackoff(min, max time.Duration, attemptNum int, resp *http.Response)
 	if resp != nil {
 		if resp.StatusCode == http.StatusTooManyRequests || resp.StatusCode == http.StatusServiceUnavailable {
 			if sleep, ok := parseRetryAfterHeader(resp.Header["Retry-After"]); ok {
-				return sleep
+				if sleep <= max return sleep
 			}
 		}
 	}