diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 673bfb1fa9e..ee79cfdefa7 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3470,6 +3470,11 @@ let
       md5 = "92978492871342ad64e8ae0ccfcf200c";
     };
 
+    preConfigure = ''
+      export LOCALE_ARCHIVE=${pkgs.glibcLocales}/lib/locale/locale-archive
+      export LC_ALL="en_US.UTF-8"
+    '';
+
     propagatedBuildInputs = [ six pytz ];
 
     meta = {
@@ -5804,6 +5809,11 @@ let
       md5 = "8e57bdd075503903125b14621b1e533d";
     };
 
+    preConfigure = ''
+      export LOCALE_ARCHIVE=${pkgs.glibcLocales}/lib/locale/locale-archive
+      export LC_ALL="en_US.UTF-8"
+    '';
+
     # Test data not provided
     #buildInputs = [nose mock];
     doCheck = false;