diff --git a/src/cowboy_http.erl b/src/cowboy_http.erl
index 6670781a..505765a5 100644
--- a/src/cowboy_http.erl
+++ b/src/cowboy_http.erl
@@ -272,7 +272,7 @@ cancel_timeout(State=#state{timer=TimerRef}) ->
 		_ ->
 			%% Do a synchronous cancel and remove the message if any
 			%% to avoid receiving stray messages.
-			erlang:cancel_timer(TimerRef),
+			_ = erlang:cancel_timer(TimerRef),
 			receive
 				{timeout, TimerRef, _} -> ok
 			after 0 ->