diff --git a/tests/Unit/Math/BigInteger/TestCase.php b/tests/Unit/Math/BigInteger/TestCase.php
index b42c0ca6..d5a6b75b 100644
--- a/tests/Unit/Math/BigInteger/TestCase.php
+++ b/tests/Unit/Math/BigInteger/TestCase.php
@@ -374,4 +374,15 @@ abstract class Unit_Math_BigInteger_TestCase extends PhpseclibTestCase
         $this->assertContains('[value] => 0x32', $str);
         return $str;
     }
+
+    /**
+     * @group github954
+     */
+    public function testSlidingWindow()
+    {
+        $e = $this->getInstance(str_repeat('1', 1794), 2);
+        $x = $this->getInstance(1);
+        $n = $this->getInstance(2);
+        $x->powMod($e, $n);
+    }
 }