diff --git a/pkgs/development/interpreters/python/cpython/2.7/default.nix b/pkgs/development/interpreters/python/cpython/2.7/default.nix
index 108dfc5514b6..fd7e684113e7 100644
--- a/pkgs/development/interpreters/python/cpython/2.7/default.nix
+++ b/pkgs/development/interpreters/python/cpython/2.7/default.nix
@@ -227,6 +227,7 @@ let
   ++ optional stdenv.hostPlatform.isLinux "ac_cv_func_lchmod=no"
   ++ optional static "LDFLAGS=-static";
 
+  strictDeps = true;
   buildInputs =
     optional (stdenv ? cc && stdenv.cc.libc != null) stdenv.cc.libc ++
     [ bzip2 openssl zlib ]