diff --git a/lib/Common/BitMatrix.php b/lib/Common/BitMatrix.php
index dec4509..96700db 100644
--- a/lib/Common/BitMatrix.php
+++ b/lib/Common/BitMatrix.php
@@ -40,7 +40,7 @@ public static function parse($stringRepresentation, $setString, $unsetString)
         $pos         = 0;
         while ($pos < strlen($stringRepresentation)) {
             if ($stringRepresentation[$pos] == '\n' ||
-                $stringRepresentation->{$pos} == '\r') {
+                $stringRepresentation[$pos] == '\r') {
                 if ($bitsPos > $rowStartPos) {
                     if ($rowLength == -1) {
                         $rowLength = $bitsPos - $rowStartPos;