diff --git a/src/EventLoop/Driver/StreamSelectDriver.php b/src/EventLoop/Driver/StreamSelectDriver.php
index 6919e35..4e09e97 100644
--- a/src/EventLoop/Driver/StreamSelectDriver.php
+++ b/src/EventLoop/Driver/StreamSelectDriver.php
@@ -287,11 +287,13 @@ private function selectStreams(array $read, array $write, float $timeout): void
         }
 
         if ($timeout < 0) { // Only signal callbacks are enabled, so sleep indefinitely.
+            /** @psalm-suppress ArgumentTypeCoercion */
             \usleep(\PHP_INT_MAX);
             return;
         }
 
         if ($timeout > 0) { // Sleep until next timer expires.
+            /** @psalm-var positive-int $timeout */
             \usleep((int) ($timeout * 1_000_000));
         }
     }