diff --git a/pkgs/applications/networking/mailreaders/notmuch/default.nix b/pkgs/applications/networking/mailreaders/notmuch/default.nix
index 69de3ef5d51..46e32978f98 100644
--- a/pkgs/applications/networking/mailreaders/notmuch/default.nix
+++ b/pkgs/applications/networking/mailreaders/notmuch/default.nix
@@ -2,7 +2,7 @@
 , pkgconfig, gnupg
 , xapian, gmime, talloc, zlib
 , doxygen, perl
-, pythonPackages
+, python3Packages
 , bash-completion
 , emacs
 , ruby
@@ -30,7 +30,7 @@ stdenv.mkDerivation rec {
     gnupg # undefined dependencies
     xapian gmime talloc zlib  # dependencies described in INSTALL
     doxygen perl  # (optional) api docs
-    pythonPackages.sphinx pythonPackages.python  # (optional) documentation -> doc/INSTALL
+    python3Packages.sphinx python3Packages.python  # (optional) documentation -> doc/INSTALL
     bash-completion  # (optional) dependency to install bash completion
     emacs  # (optional) to byte compile emacs code, also needed for tests
     ruby  # (optional) ruby bindings