diff --git a/src/Driver/CoreDriver.php b/src/Driver/CoreDriver.php
index a5940ff91..6b509a166 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 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(?int $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..b5e397b1b 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 int|null $name iframe name (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(?int $name = null);
 
     /**
      * Sets specific request header on client.