diff --git a/tamper/unionalltounion.py b/tamper/unionalltounion.py
new file mode 100644
index 000000000..8199702c7
--- /dev/null
+++ b/tamper/unionalltounion.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+
+"""
+$Id$
+
+Copyright (c) 2006-2012 sqlmap developers (http://www.sqlmap.org/)
+See the file 'doc/COPYING' for copying permission
+"""
+
+import re
+
+from lib.core.enums import PRIORITY
+
+__priority__ = PRIORITY.HIGHEST
+
+def dependencies():
+    pass
+
+def tamper(payload):
+    """
+    Replaces UNION ALL SELECT with UNION SELECT
+
+    Example:
+        * Input: -1 UNION ALL SELECT
+        * Output: -1 UNION SELECT
+    """
+
+    return payload.replace("UNION ALL SELECT", "UNION SELECT") if payload else payload