diff --git a/src/unix/signal.c b/src/unix/signal.c
index f7fd2e5e4..22c7783b9 100644
--- a/src/unix/signal.c
+++ b/src/unix/signal.c
@@ -160,7 +160,7 @@ static void uv__signal_handler(int signum) {
     } while (r == -1 && errno == EINTR);
 
     assert(r == sizeof msg ||
-           (r == -1 && errno != EAGAIN && errno != EWOULDBLOCK));
+           (r == -1 && (errno == EAGAIN || errno == EWOULDBLOCK)));
 
     if (r != -1)
       handle->caught_signals++;