diff --git a/backend/cmk_parser.py b/backend/cmk_parser.py
index a28cd13..181302b 100644
--- a/backend/cmk_parser.py
+++ b/backend/cmk_parser.py
@@ -45,7 +45,7 @@ def parseBGPData(raw, asno):
 
     # mkify
     raw = d.group(2).split("\n")
-    arr = filter(lambda _z: _z, map(lambda _y: filter(lambda _x: _x, re.split(r"\s+", _y)), raw))
+    arr = list(filter(lambda _z: _z, map(lambda _y: list(filter(lambda _x: _x, re.split(r"\s+", _y))), raw)))
 
     # parse for bird/quagga
     result = None
@@ -80,7 +80,7 @@ def parseBird(data, raw, asno):
     status = _birdFindTable(data, "show status")
     if status[2][0] != "1011-Router":
         err("Couldn't find router id in bird output")
-    peers = filter(lambda _x: _x["type"] == "BGP", _birdMakeProtocols(data))
+    peers = list(filter(lambda _x: _x["type"] == "BGP", _birdMakeProtocols(data)))
 
     if asno == None:
         err("Host is bird")
@@ -135,7 +135,7 @@ def _birdMakeProtocols(info):
     #   state (established, active)
     #   if error, last error is avilable
     protocols = []
-    for proto, data in _birdFindProtocols(info).iteritems():
+    for proto, data in _birdFindProtocols(info).items():
         protoInfo = {
             "name": proto,
             "type": data[0][1],
@@ -343,7 +343,7 @@ def _quaggaFindRoutes(raw):
                         d["network"] = lastIP
 
                     # "parse" path (everything after 61 chars, but no i)
-                    path = filter(lambda _x: _x not in ('', 'i'), line[61:].split(" "))
+                    path = list(filter(lambda _x: _x not in ('', 'i'), line[61:].split(" ")))
 
                     # currently skip incomplete routes
                     if '?' not in path: