diff --git a/modules/member/member.controller.php b/modules/member/member.controller.php
index 6bb8db38d..2ccc7b78c 100644
--- a/modules/member/member.controller.php
+++ b/modules/member/member.controller.php
@@ -1154,7 +1154,12 @@
                 $nr2 += ($nr2 << 8) ^ $nr;
                 $add += $tmp;
             }
-            $nr2 += 0x80000000;
+            $result1 = sprintf("%08lx", $nr & ((1 << 31) -1));
+            $result2 = sprintf("%08lx", $nr2 & ((1 << 31) -1));
+
+            if($result1 == '80000000') $nr += 0x80000000;
+            if($result2 == '80000000') $nr2 += 0x80000000;
+
             return sprintf("%08lx%08lx", $nr, $nr2);
         }
     }