1 files changed, 2 insertions, 2 deletions
diff --git a/lib/facebook-graph-sdk/src/Facebook/PseudoRandomString/PseudoRandomStringGeneratorTrait.php b/lib/facebook-graph-sdk/src/Facebook/PseudoRandomString/PseudoRandomStringGeneratorTrait.php
index a41ce59..0f587ea 100644
--- a/lib/facebook-graph-sdk/src/Facebook/PseudoRandomString/PseudoRandomStringGeneratorTrait.php
+++ b/lib/facebook-graph-sdk/src/Facebook/PseudoRandomString/PseudoRandomStringGeneratorTrait.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
  *
  * You are hereby granted a non-exclusive, worldwide, royalty-free license to
  * use, copy, modify, and distribute this software in source code or binary
@@ -53,6 +53,6 @@ trait PseudoRandomStringGeneratorTrait
      */
     public function binToHex($binaryData, $length)
     {
-        return mb_substr(bin2hex($binaryData), 0, $length);
+        return \substr(\bin2hex($binaryData), 0, $length);
     }
 }