diff --git a/src/PollingTrait.php b/src/PollingTrait.php
index 40922e23f..526b01255 100644
--- a/src/PollingTrait.php
+++ b/src/PollingTrait.php
@@ -68,7 +68,7 @@ private function poll(callable $pollCallable, array $options)
             if ($pollCallable()) {
                 return true;
             }
-            $currentPollDelayMillis = min([
+            $currentPollDelayMillis = (int) min([
                 $currentPollDelayMillis * $pollDelayMultiplier,
                 $maxPollDelayMillis
             ]);
diff --git a/tests/Tests/Unit/OperationResponseTest.php b/tests/Tests/Unit/OperationResponseTest.php
index bdf331f77..b5ceef7c9 100644
--- a/tests/Tests/Unit/OperationResponseTest.php
+++ b/tests/Tests/Unit/OperationResponseTest.php
@@ -341,6 +341,18 @@ public function testNoDeleteOperation()
         $operationResponse->delete();
     }
 
+    public function testPollingCastToInt()
+    {
+        $op = $this->createOperationResponse([], 3);
+        $op->pollUntilComplete([
+            'initialPollDelayMillis' => 3.0,
+            'pollDelayMultiplier' => 1.5,
+        ]);
+
+        $this->assertEquals($op->isDone(), true);
+        $this->assertEquals($op->getSleeps(), [3, 4, 6]);
+    }
+
     private function createOperationResponse($options, $reloadCount)
     {
         $opName = 'operations/opname';