diff --git a/src/Collins/Sign/JWS/Crypto/CSPRNG.php b/src/Collins/Sign/JWS/Crypto/CSPRNG.php
index 671acfd..d6e999a 100644
--- a/src/Collins/Sign/JWS/Crypto/CSPRNG.php
+++ b/src/Collins/Sign/JWS/Crypto/CSPRNG.php
@@ -160,7 +160,7 @@ public function GetInt($min, $max)
 
             $result = 0;
             for ($x = 0; $x < $numbytes; $x++) {
-                $result = ($result * 256) + ord($data{$x});
+                $result = ($result * 256) + ord($data[$x]);
             }
 
             $result = $result & $mask;
@@ -179,7 +179,7 @@ public function GenerateString($size = 32)
                 return false;
             }
 
-            $result .= self::$alphanum{$data};
+            $result .= self::$alphanum[$data];
         }
 
         return $result;
@@ -202,4 +202,4 @@ protected static function RNG_Translate()
             $args
         );
     }
-}
\ No newline at end of file
+}