diff --git a/pkgs/applications/networking/irc/weechat/default.nix b/pkgs/applications/networking/irc/weechat/default.nix
index 3f8ad762218c..31f2a7e6a276 100644
--- a/pkgs/applications/networking/irc/weechat/default.nix
+++ b/pkgs/applications/networking/irc/weechat/default.nix
@@ -6,21 +6,21 @@
 , guileSupport ? true, guile
 , luaSupport ? true, lua5
 , perlSupport ? true, perl
-, pythonSupport ? true, pythonPackages
+, pythonSupport ? true, python3Packages
 , rubySupport ? true, ruby
 , tclSupport ? true, tcl
 , extraBuildInputs ? []
 }:
 
 let
-  inherit (pythonPackages) python;
+  inherit (python3Packages) python;
   plugins = [
     { name = "perl"; enabled = perlSupport; cmakeFlag = "ENABLE_PERL"; buildInputs = [ perl ]; }
     { name = "tcl"; enabled = tclSupport; cmakeFlag = "ENABLE_TCL"; buildInputs = [ tcl ]; }
     { name = "ruby"; enabled = rubySupport; cmakeFlag = "ENABLE_RUBY"; buildInputs = [ ruby ]; }
     { name = "guile"; enabled = guileSupport; cmakeFlag = "ENABLE_GUILE"; buildInputs = [ guile ]; }
     { name = "lua"; enabled = luaSupport; cmakeFlag = "ENABLE_LUA"; buildInputs = [ lua5 ]; }
-    { name = "python"; enabled = pythonSupport; cmakeFlag = "ENABLE_PYTHON"; buildInputs = [ python ]; }
+    { name = "python"; enabled = pythonSupport; cmakeFlag = "ENABLE_PYTHON3"; buildInputs = [ python ]; }
   ];
   enabledPlugins = builtins.filter (p: p.enabled) plugins;
 
diff --git a/pkgs/applications/networking/irc/weechat/scripts/default.nix b/pkgs/applications/networking/irc/weechat/scripts/default.nix
index 4b20c1046f99..7ac1eb4940c3 100644
--- a/pkgs/applications/networking/irc/weechat/scripts/default.nix
+++ b/pkgs/applications/networking/irc/weechat/scripts/default.nix
@@ -1,4 +1,4 @@
-{ callPackage, luaPackages, pythonPackages }:
+{ callPackage, luaPackages }:
 
 {
   weechat-xmpp = callPackage ./weechat-xmpp {
@@ -9,13 +9,9 @@
     inherit (luaPackages) cjson luaffi;
   };
 
-  wee-slack = callPackage ./wee-slack {
-    inherit pythonPackages;
-  };
+  wee-slack = callPackage ./wee-slack { };
 
   weechat-autosort = callPackage ./weechat-autosort { };
 
-  weechat-otr = callPackage ./weechat-otr {
-    inherit pythonPackages;
-  };
+  weechat-otr = callPackage ./weechat-otr { };
 }
diff --git a/pkgs/applications/networking/irc/weechat/scripts/wee-slack/default.nix b/pkgs/applications/networking/irc/weechat/scripts/wee-slack/default.nix
index 49616671507d..6811cb164e0e 100644
--- a/pkgs/applications/networking/irc/weechat/scripts/wee-slack/default.nix
+++ b/pkgs/applications/networking/irc/weechat/scripts/wee-slack/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, substituteAll, buildEnv, fetchFromGitHub, pythonPackages }:
+{ stdenv, substituteAll, buildEnv, fetchFromGitHub, python3Packages }:
 
 stdenv.mkDerivation rec {
   pname = "wee-slack";
@@ -16,8 +16,8 @@ stdenv.mkDerivation rec {
       src = ./libpath.patch;
       env = "${buildEnv {
         name = "wee-slack-env";
-        paths = with pythonPackages; [ websocket_client six ];
-      }}/${pythonPackages.python.sitePackages}";
+        paths = with python3Packages; [ websocket_client six ];
+      }}/${python3Packages.python.sitePackages}";
     })
   ];
 
diff --git a/pkgs/applications/networking/irc/weechat/scripts/weechat-otr/default.nix b/pkgs/applications/networking/irc/weechat/scripts/weechat-otr/default.nix
index c22903c0ece8..9682aa3169ac 100644
--- a/pkgs/applications/networking/irc/weechat/scripts/weechat-otr/default.nix
+++ b/pkgs/applications/networking/irc/weechat/scripts/weechat-otr/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, substituteAll, buildEnv, fetchgit, fetchFromGitHub, pythonPackages, gmp }:
+{ stdenv, substituteAll, buildEnv, fetchgit, fetchFromGitHub, python3Packages, gmp }:
 
 let
   # pure-python-otr (potr) requires an older version of pycrypto, which is
@@ -6,7 +6,7 @@ let
   # of pycrypto will be fetched from the Debian project.
   # https://security-tracker.debian.org/tracker/source-package/python-crypto
 
-  pycrypto = pythonPackages.buildPythonPackage rec {
+  pycrypto = python3Packages.buildPythonPackage rec {
     pname = "pycrypto";
     version = "2.6.1-10";
 
@@ -24,7 +24,7 @@ let
     '';
   };
 
-  potr = pythonPackages.potr.overridePythonAttrs (oldAttrs: {
+  potr = python3Packages.potr.overridePythonAttrs (oldAttrs: {
     propagatedBuildInputs = [ pycrypto ];
   });
 in stdenv.mkDerivation rec {
@@ -44,7 +44,7 @@ in stdenv.mkDerivation rec {
       env = "${buildEnv {
         name = "weechat-otr-env";
         paths = [ potr pycrypto ];
-      }}/${pythonPackages.python.sitePackages}";
+      }}/${python3Packages.python.sitePackages}";
     })
   ];
 
diff --git a/pkgs/applications/networking/irc/weechat/wrapper.nix b/pkgs/applications/networking/irc/weechat/wrapper.nix
index e6fa95488e10..5c06bb8517a2 100644
--- a/pkgs/applications/networking/irc/weechat/wrapper.nix
+++ b/pkgs/applications/networking/irc/weechat/wrapper.nix
@@ -1,5 +1,5 @@
 { lib, runCommand, writeScriptBin, buildEnv
-, pythonPackages, perlPackages, runtimeShell
+, python3Packages, perlPackages, runtimeShell
 }:
 
 weechat:
@@ -17,11 +17,11 @@ let
       in rec {
         python = (simplePlugin "python") // {
           extraEnv = ''
-            export PATH="${pythonPackages.python}/bin:$PATH"
+            export PATH="${python3Packages.python}/bin:$PATH"
           '';
           withPackages = pkgsFun: (python // {
             extraEnv = ''
-              export PYTHONHOME="${pythonPackages.python.withPackages pkgsFun}"
+              export PYTHONHOME="${python3Packages.python.withPackages pkgsFun}"
             '';
           });
         };