diff --git a/pkgs/development/interpreters/python/2.6/default.nix b/pkgs/development/interpreters/python/2.6/default.nix
index d51838af5ad..1217403f3fd 100644
--- a/pkgs/development/interpreters/python/2.6/default.nix
+++ b/pkgs/development/interpreters/python/2.6/default.nix
@@ -71,10 +71,11 @@ let
         ln -s $out/share/man/man1/{python2.6.1,python.1}
       '';
 
-    passthru = {
+    passthru = rec {
       inherit zlibSupport;
       libPrefix = "python${majorVersion}";
-      executable = "python2.6";
+      executable = libPrefix;
+      sitePackages = "lib/${libPrefix}/site-packages";
     };
 
     enableParallelBuilding = true;
diff --git a/pkgs/development/interpreters/python/2.7/default.nix b/pkgs/development/interpreters/python/2.7/default.nix
index 388a0c9b134..df38299cb1c 100644
--- a/pkgs/development/interpreters/python/2.7/default.nix
+++ b/pkgs/development/interpreters/python/2.7/default.nix
@@ -85,10 +85,11 @@ let
         paxmark E $out/bin/python${majorVersion}
       '';
 
-    passthru = {
+    passthru = rec {
       inherit zlibSupport;
       libPrefix = "python${majorVersion}";
-      executable = "python2.7";
+      executable = libPrefix;
+      sitePackages = "lib/${libPrefix}/site-packages";
     };
 
     enableParallelBuilding = true;
diff --git a/pkgs/development/interpreters/python/3.2/default.nix b/pkgs/development/interpreters/python/3.2/default.nix
index f474ae659de..3451b218f74 100644
--- a/pkgs/development/interpreters/python/3.2/default.nix
+++ b/pkgs/development/interpreters/python/3.2/default.nix
@@ -60,7 +60,7 @@ stdenv.mkDerivation {
     ln -s "$out/include/python${majorVersion}m" "$out/include/python${majorVersion}"
   '';
 
-  passthru = {
+  passthru = rec {
     zlibSupport = zlib != null;
     sqliteSupport = sqlite != null;
     dbSupport = db != null;
@@ -70,6 +70,7 @@ stdenv.mkDerivation {
     libPrefix = "python${majorVersion}";
     executable = "python3.2m";
     is_py3k = true;
+    sitePackages = "lib/${libPrefix}/site-packages";
   };
 
   enableParallelBuilding = true;
diff --git a/pkgs/development/interpreters/python/3.3/default.nix b/pkgs/development/interpreters/python/3.3/default.nix
index 36be9e0dad6..20fc66367ca 100644
--- a/pkgs/development/interpreters/python/3.3/default.nix
+++ b/pkgs/development/interpreters/python/3.3/default.nix
@@ -57,7 +57,7 @@ stdenv.mkDerivation {
     paxmark E $out/bin/python${majorVersion}
   '';
 
-  passthru = {
+  passthru = rec {
     zlibSupport = zlib != null;
     sqliteSupport = sqlite != null;
     dbSupport = db != null;
@@ -67,6 +67,7 @@ stdenv.mkDerivation {
     libPrefix = "python${majorVersion}";
     executable = "python3.3m";
     is_py3k = true;
+    sitePackages = "lib/${libPrefix}/site-packages";
   };
 
   enableParallelBuilding = true;
diff --git a/pkgs/development/interpreters/python/3.4/default.nix b/pkgs/development/interpreters/python/3.4/default.nix
index 2ce4413a2c0..a468807dcbd 100644
--- a/pkgs/development/interpreters/python/3.4/default.nix
+++ b/pkgs/development/interpreters/python/3.4/default.nix
@@ -58,7 +58,7 @@ stdenv.mkDerivation {
     paxmark E $out/bin/python${majorVersion}
   '';
 
-  passthru = {
+  passthru = rec {
     zlibSupport = zlib != null;
     sqliteSupport = sqlite != null;
     dbSupport = db != null;
@@ -68,6 +68,7 @@ stdenv.mkDerivation {
     libPrefix = "python${majorVersion}";
     executable = "python3.4m";
     is_py3k = true;
+    sitePackages = "lib/${libPrefix}/site-packages";
   };
 
   enableParallelBuilding = true;