diff --git a/modules/home-environment.nix b/modules/home-environment.nix
index e1087f8d..a25501fd 100644
--- a/modules/home-environment.nix
+++ b/modules/home-environment.nix
@@ -146,7 +146,7 @@ in
 
     home.sessionVariables = mkOption {
       default = {};
-      type = types.attrs;
+      type = with types; attrsOf (either int str);
       example = { EDITOR = "emacs"; GS_OPTIONS = "-sPAPERSIZE=a4"; };
       description = ''
         Environment variables to always set at login.