diff --git a/lib/request/basic.py b/lib/request/basic.py
index ac887e08c..e361c4dad 100755
--- a/lib/request/basic.py
+++ b/lib/request/basic.py
@@ -95,8 +95,7 @@ def forgeHeaders(items=None):
                         kb.mergeCookies = not _ or _[0] in ("y", "Y")
 
                     if kb.mergeCookies:
-                        _ = lambda x: re.sub("(?i)%s=[^%s]+" % (cookie.name, conf.cookieDel or DEFAULT_COOKIE_DELIMITER), "%s=%s" % (cookie.name, getUnicode(cookie.value)), x)
-                        headers[HTTP_HEADER.COOKIE] = _(headers[HTTP_HEADER.COOKIE])
+                        headers[HTTP_HEADER.COOKIE] = re.sub(r"(?i)\b%s=[^%s]+" % (re.escape(cookie.name), conf.cookieDel or DEFAULT_COOKIE_DELIMITER), "%s=%s" % (cookie.name, getUnicode(cookie.value)), headers[HTTP_HEADER.COOKIE])
 
                         if PLACE.COOKIE in conf.parameters:
                             conf.parameters[PLACE.COOKIE] = _(conf.parameters[PLACE.COOKIE])