diff --git a/src/TerminalObject/Helper/Sleeper.php b/src/TerminalObject/Helper/Sleeper.php
index b0ae6398..c94d8a56 100644
--- a/src/TerminalObject/Helper/Sleeper.php
+++ b/src/TerminalObject/Helper/Sleeper.php
@@ -7,7 +7,7 @@ class Sleeper implements SleeperInterface
     /**
      * The default length of the sleep
      *
-     * @var int|float $speed
+     * @var int $speed
      */
     protected $speed = 50000;
 
@@ -16,12 +16,12 @@ class Sleeper implements SleeperInterface
      *
      * @param int|float $percentage
      *
-     * @return float
+     * @return int
      */
     public function speed($percentage)
     {
         if (is_numeric($percentage) && $percentage > 0) {
-            $this->speed *= (100 / $percentage);
+            $this->speed = (int) round($this->speed * (100 / $percentage));
         }
 
         return $this->speed;
diff --git a/tests/SleeperTest.php b/tests/SleeperTest.php
index ad9d461a..8b2525e5 100644
--- a/tests/SleeperTest.php
+++ b/tests/SleeperTest.php
@@ -58,4 +58,16 @@ public function it_will_ignore_zero_percentages()
 
         $sleeper->sleep();
     }
+
+
+    /**
+     * @test
+     */
+    public function it_uses_whole_integers_only()
+    {
+        $sleeper = new Sleeper();
+
+        $result = $sleeper->speed(33);
+        self::assertSame(151515, $result);
+    }
 }