diff --git a/lib/request/basic.py b/lib/request/basic.py
index e87bce1ee..d5bcc96d4 100755
--- a/lib/request/basic.py
+++ b/lib/request/basic.py
@@ -103,7 +103,7 @@ def forgeHeaders(items=None):
                         kb.mergeCookies = not _ or _[0] in ("y", "Y")
 
                     if kb.mergeCookies and kb.injection.place != PLACE.COOKIE:
-                        _ = lambda x: re.sub(r"(?i)\b%s=[^%s]+" % (re.escape(cookie.name), conf.cookieDel or DEFAULT_COOKIE_DELIMITER), "%s=%s" % (cookie.name, getUnicode(cookie.value)), x)
+                        _ = lambda x: re.sub(r"(?i)\b%s=[^%s]+" % (re.escape(cookie.name), conf.cookieDel or DEFAULT_COOKIE_DELIMITER), ("%s=%s" % (cookie.name, getUnicode(cookie.value))).replace('\\', r'\\'), x)
                         headers[HTTP_HEADER.COOKIE] = _(headers[HTTP_HEADER.COOKIE])
 
                         if PLACE.COOKIE in conf.parameters: