diff --git a/lib/core/agent.py b/lib/core/agent.py
index 11abd2870..1ce0ecef2 100644
--- a/lib/core/agent.py
+++ b/lib/core/agent.py
@@ -103,7 +103,7 @@ class Agent(object):
             elif kb.postHint == POST_HINT.JSON_LIKE:
                 origValue = extractRegexResult(r'(?s)\'\s*:\s*(?P<result>\d+\Z)', origValue) or extractRegexResult(r"(?s)(?P<result>[^']+\Z)", origValue)
             else:
-                _ = extractRegexResult(r"(?s)(?P<result>[^\s<>{}();'\"]+\Z)", origValue) or ""
+                _ = extractRegexResult(r"(?s)(?P<result>[^\s<>{}();'\"&]+\Z)", origValue) or ""
                 origValue = _.split('=', 1)[1] if '=' in _ else ""
         elif place == PLACE.CUSTOM_HEADER:
             paramString = origValue