diff --git a/pkgs/development/interpreters/python/3.4/default.nix b/pkgs/development/interpreters/python/3.4/default.nix
index 3cadfc2d22f..8c86f77ff75 100644
--- a/pkgs/development/interpreters/python/3.4/default.nix
+++ b/pkgs/development/interpreters/python/3.4/default.nix
@@ -42,7 +42,10 @@ stdenv.mkDerivation {
     for i in /usr /sw /opt /pkg; do	# improve purity
       substituteInPlace ./setup.py --replace $i /no-such-path
     done
-    ${optionalString stdenv.isDarwin ''export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -msse2"''}
+    ${optionalString stdenv.isDarwin ''
+       export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -msse2"
+       export MACOSX_DEPLOYMENT_TARGET=10.6
+     ''}
 
     configureFlagsArray=( --enable-shared --with-threads
                           CPPFLAGS="${concatStringsSep " " (map (p: "-I${p}/include") buildInputs)}"