diff --git a/src/Driver/CoreDriver.php b/src/Driver/CoreDriver.php
index a5940ff91..da89f04e0 100644
--- a/src/Driver/CoreDriver.php
+++ b/src/Driver/CoreDriver.php
@@ -160,14 +160,14 @@ public function switchToWindow(?string $name = null)
     }
 
     /**
-     * @param string|null $name
+     * @param string|int|null $name
      *
      * @return void
      *
      * @throws UnsupportedDriverActionException When operation not supported by the driver
      * @throws DriverException                  When the operation cannot be done
      */
-    public function switchToIFrame(?string $name = null)
+    public function switchToIFrame($name = null)
     {
         throw new UnsupportedDriverActionException('iFrames management is not supported by %s', $this);
     }
diff --git a/src/Driver/DriverInterface.php b/src/Driver/DriverInterface.php
index a8a96b3f9..9a7d4cd33 100644
--- a/src/Driver/DriverInterface.php
+++ b/src/Driver/DriverInterface.php
@@ -184,14 +184,14 @@ public function switchToWindow(?string $name = null);
     /**
      * Switches to specific iFrame.
      *
-     * @param string|null $name iframe name (null for switching back)
+     * @param string|int|null $name iframe name/index (null for switching back)
      *
      * @return void
      *
      * @throws UnsupportedDriverActionException When operation not supported by the driver
      * @throws DriverException                  When the operation cannot be done
      */
-    public function switchToIFrame(?string $name = null);
+    public function switchToIFrame($name = null);
 
     /**
      * Sets specific request header on client.
diff --git a/src/Session.php b/src/Session.php
index 71a86bdf6..249dadc61 100644
--- a/src/Session.php
+++ b/src/Session.php
@@ -355,11 +355,11 @@ public function switchToWindow(?string $name = null)
     /**
      * Switches to specific iFrame.
      *
-     * @param string|null $name iframe name (null for switching back)
+     * @param string|int|null $name iframe name/index (null for switching back)
      *
      * @return void
      */
-    public function switchToIFrame(?string $name = null)
+    public function switchToIFrame($name = null)
     {
         $this->driver->switchToIFrame($name);
     }
diff --git a/tests/SessionTest.php b/tests/SessionTest.php
index e1ecc4665..e1115de5b 100644
--- a/tests/SessionTest.php
+++ b/tests/SessionTest.php
@@ -296,13 +296,29 @@ public function testSwitchToWindow()
         $this->session->switchToWindow('test');
     }
 
-    public function testSwitchToIFrame()
+    /**
+     * @param string|int $iframeIdentifier
+     *
+     * @dataProvider iFrameDataProvider
+     */
+    public function testSwitchToIFrame($iframeIdentifier)
     {
         $this->driver->expects($this->once())
             ->method('switchToIFrame')
-            ->with('test');
+            ->with($iframeIdentifier);
+
+        $this->session->switchToIFrame($iframeIdentifier);
+    }
 
-        $this->session->switchToIFrame('test');
+    /**
+     * @return array
+     */
+    public function iFrameDataProvider()
+    {
+        return array(
+            'by name' => array('test'),
+            'by index' => array(0),
+        );
     }
 
     public function testExecuteScript()