diff --git a/pkgs/development/python-modules/generic/default.nix b/pkgs/development/python-modules/generic/default.nix
index dab20b2f7447..15f369a44f2d 100644
--- a/pkgs/development/python-modules/generic/default.nix
+++ b/pkgs/development/python-modules/generic/default.nix
@@ -3,7 +3,8 @@
    (http://pypi.python.org/pypi/setuptools/), which represents a large
    number of Python packages nowadays.  */
 
-{ python, setuptools, unzip, wrapPython, lib, bootstrapped-pip }:
+{ python, setuptools, unzip, wrapPython, lib, bootstrapped-pip
+, ensureNewerSourcesHook }:
 
 { name
 
@@ -60,6 +61,7 @@ python.stdenv.mkDerivation (builtins.removeAttrs attrs ["disabled" "doCheck"] //
   name = namePrefix + name;
 
   buildInputs = [ wrapPython bootstrapped-pip ] ++ buildInputs ++ pythonPath
+    ++ [ (ensureNewerSourcesHook { year = "1980"; }) ]
     ++ (lib.optional (lib.hasSuffix "zip" attrs.src.name or "") unzip);
 
   # propagate python/setuptools to active setup-hook in nix-shell
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 0eda14f2f4cb..393eb4b37c88 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -259,6 +259,14 @@ let
     { substitutions = { inherit autoconf automake gettext libtool; }; }
     ../build-support/setup-hooks/autoreconf.sh;
 
+  ensureNewerSourcesHook = { year }: makeSetupHook {}
+    (writeScript "ensure-newer-sources-hook.sh" ''
+      postUnpackHooks+=(_ensureNewerSources)
+      _ensureNewerSources() {
+        find "$sourceRoot" '!' -newermt '${year}-01-01' -exec touch -d '${year}-01-02' '{}' '+'
+      }
+    '');
+
   buildEnv = callPackage ../build-support/buildenv { }; # not actually a package
 
   buildFHSEnv = callPackage ../build-support/build-fhs-chrootenv/env.nix {