diff --git a/pkgs/development/tools/misc/itstool/default.nix b/pkgs/development/tools/misc/itstool/default.nix
index fa8002d4f6c..8c2686d9a22 100644
--- a/pkgs/development/tools/misc/itstool/default.nix
+++ b/pkgs/development/tools/misc/itstool/default.nix
@@ -1,4 +1,5 @@
-{ stdenv, fetchurl, python, libxml2Python }:
+{ stdenv, fetchurl, python2, libxml2Python }:
+# We need the same Python as is used to build libxml2Python
 
 stdenv.mkDerivation rec {
   name = "itstool-2.0.2";
@@ -8,12 +9,12 @@ stdenv.mkDerivation rec {
     sha256 = "bf909fb59b11a646681a8534d5700fec99be83bb2c57badf8c1844512227033a";
   };
 
-  buildInputs = [ python libxml2Python ];
+  buildInputs = [ python2 libxml2Python ];
 
   patchPhase =
     ''
       sed -e '/import libxml2/i import sys\
-      sys.path.append("${libxml2Python}/lib/${python.libPrefix}/site-packages")' \
+      sys.path.append("${libxml2Python}/lib/${python2.libPrefix}/site-packages")' \
       -i itstool.in
     '';