diff --git a/pkgs/development/interpreters/python/3.3/default.nix b/pkgs/development/interpreters/python/3.3/default.nix
index 60d56597ea0f..be770a85a1ec 100644
--- a/pkgs/development/interpreters/python/3.3/default.nix
+++ b/pkgs/development/interpreters/python/3.3/default.nix
@@ -32,6 +32,8 @@ stdenv.mkDerivation {
   pythonVersion = majorVersion;
   inherit majorVersion version;
 
+  inherit buildInputs;
+
   src = fetchurl {
     url = "http://www.python.org/ftp/python/${version}/Python-${version}.tar.xz";
     sha256 = "0gsxpgd5p4mwd01gw501vsyahncyw3h9836ypkr3y32kgazy89jj";
diff --git a/pkgs/development/interpreters/python/3.4/default.nix b/pkgs/development/interpreters/python/3.4/default.nix
index 517dfc3d8b27..1f6a929f9cdc 100644
--- a/pkgs/development/interpreters/python/3.4/default.nix
+++ b/pkgs/development/interpreters/python/3.4/default.nix
@@ -27,15 +27,27 @@ let
   fullVersion = "${version}";
 
   buildInputs = filter (p: p != null) [
-    zlib bzip2 lzma gdbm sqlite db readline ncurses openssl tcl tk libX11 xproto
-  ];
+    zlib
+    bzip2
+    lzma
+    gdbm
+    sqlite
+    db
+    readline
+    ncurses
+    openssl
+    tcl
+    tk
+    libX11
+    xproto
+  ] ++ optionals stdenv.isDarwin [ CF configd ];
 in
 stdenv.mkDerivation {
   name = "python3-${fullVersion}";
   pythonVersion = majorVersion;
   inherit majorVersion version;
 
-  buildInputs = optionals stdenv.isDarwin [ CF configd ];
+  inherit buildInputs;
 
   src = fetchurl {
     url = "http://www.python.org/ftp/python/${version}/Python-${fullVersion}.tar.xz";
diff --git a/pkgs/development/interpreters/python/3.5/default.nix b/pkgs/development/interpreters/python/3.5/default.nix
index 15e02d1ab3ed..91ad8fda8068 100644
--- a/pkgs/development/interpreters/python/3.5/default.nix
+++ b/pkgs/development/interpreters/python/3.5/default.nix
@@ -27,15 +27,27 @@ let
   fullVersion = "${version}";
 
   buildInputs = filter (p: p != null) [
-    zlib bzip2 lzma gdbm sqlite db readline ncurses openssl tcl tk libX11 xproto
-  ];
+    zlib
+    bzip2
+    lzma
+    gdbm
+    sqlite
+    db
+    readline
+    ncurses
+    openssl
+    tcl
+    tk
+    libX11
+    xproto
+  ] ++ optionals stdenv.isDarwin [ CF configd ];
 in
 stdenv.mkDerivation {
   name = "python3-${fullVersion}";
   pythonVersion = majorVersion;
   inherit majorVersion version;
 
-  buildInputs = optionals stdenv.isDarwin [ CF configd ];
+  inherit buildInputs;
 
   src = fetchurl {
     url = "http://www.python.org/ftp/python/${version}/Python-${fullVersion}.tar.xz";