diff --git a/addons/document_webdav/webdav_server.py b/addons/document_webdav/webdav_server.py
index df2c4a871f6..52356596af0 100644
--- a/addons/document_webdav/webdav_server.py
+++ b/addons/document_webdav/webdav_server.py
@@ -36,10 +36,13 @@ from service.websrv_lib import HTTPDir, FixSendError, HttpOptions
 from BaseHTTPServer import BaseHTTPRequestHandler
 import urlparse
 import urllib
+import re
 from string import atoi,split
 from DAV.errors import *
 # from DAV.constants import DAV_VERSION_1, DAV_VERSION_2
 
+khtml_re = re.compile(r' KHTML/([0-9\.]+) ')
+
 def OpenDAVConfig(**kw):
     class OpenDAV:
         def __init__(self, **kw):
@@ -131,6 +134,16 @@ class DAVHandler(HttpOptions, FixSendError, DAVRequestHandler):
         # the BufferingHttpServer will send Connection: close , while
         # the BaseHTTPRequestHandler will only accept int code.
         # workaround both of them.
+        if self.command == 'PROPFIND' and int(code) == 404:
+            kh = khtml_re.search(self.headers.get('User-Agent',''))
+            if kh and (kh.group(1) < '4.5'):
+                # There is an ugly bug in all khtml < 4.5.x, where the 404
+                # response is treated as an immediate error, which would even
+                # break the flow of a subsequent PUT request. At the same time,
+                # the 200 response  (rather than 207 with content) is treated
+                # as "path not exist", so we send this instead
+                # https://bugs.kde.org/show_bug.cgi?id=166081
+                code = 200
         BaseHTTPRequestHandler.send_response(self, int(code), message)
 
     def send_header(self, key, value):