diff --git a/phpseclib/Math/BigInteger.php b/phpseclib/Math/BigInteger.php
index 58dcd511..2980d4c3 100644
--- a/phpseclib/Math/BigInteger.php
+++ b/phpseclib/Math/BigInteger.php
@@ -154,7 +154,7 @@ class BigInteger implements \JsonSerializable
                 }
             }
 
-            throw new UnexpectedValueException('No valid BigInteger found. This is only possible when JIT is enabled on Windows and neither the GMP or BCMath extensions are available so either disable JIT or install GMP / BCMath');
+            throw new \UnexpectedValueException('No valid BigInteger found. This is only possible when JIT is enabled on Windows and neither the GMP or BCMath extensions are available so either disable JIT or install GMP / BCMath');
         }
     }