diff --git a/lib/Loop/NativeDriver.php b/lib/Loop/NativeDriver.php
index ac2d0ad..045f2a1 100644
--- a/lib/Loop/NativeDriver.php
+++ b/lib/Loop/NativeDriver.php
@@ -276,7 +276,7 @@ class NativeDriver extends Driver
                 continue;
             }
 
-            $expiration -= getCurrentTime();
+            $expiration -= $this->now();
 
             if ($expiration < 0) {
                 return 0;
diff --git a/test/Loop/DriverTest.php b/test/Loop/DriverTest.php
index 9bec2ca..c28fbeb 100644
--- a/test/Loop/DriverTest.php
+++ b/test/Loop/DriverTest.php
@@ -1563,8 +1563,8 @@ abstract class DriverTest extends TestCase
             $new = $this->loop->now();
 
             // Allow a few milliseconds of inaccuracy.
-            $this->assertGreaterThanOrEqual($now - 5, $new);
-            $this->assertLessThanOrEqual($now + 5, $new);
+            $this->assertGreaterThanOrEqual($now - 1, $new);
+            $this->assertLessThanOrEqual($now + 10, $new);
 
             // Same time should be returned from later call.
             $this->assertSame($new, $this->loop->now());
diff --git a/test/LoopTest.php b/test/LoopTest.php
index 19755ff..aec6a9f 100644
--- a/test/LoopTest.php
+++ b/test/LoopTest.php
@@ -55,8 +55,8 @@ class LoopTest extends TestCase
                 $new = Loop::now();
 
                 // Allow a few milliseconds of inaccuracy.
-                $this->assertGreaterThanOrEqual($now - 5, $new);
-                $this->assertLessThanOrEqual($now + 5, $new);
+                $this->assertGreaterThanOrEqual($now - 1, $new);
+                $this->assertLessThanOrEqual($now + 10, $new);
 
                 // Same time should be returned from later call.
                 $this->assertSame($new, Loop::now());