diff --git a/nixos/modules/system/boot/modprobe.nix b/nixos/modules/system/boot/modprobe.nix
index a1feaad6132..a3b616ff3ef 100644
--- a/nixos/modules/system/boot/modprobe.nix
+++ b/nixos/modules/system/boot/modprobe.nix
@@ -101,7 +101,7 @@ with lib;
         echo ${config.system.sbin.modprobe}/sbin/modprobe > /proc/sys/kernel/modprobe
       '';
 
-    environment.variables.MODULE_DIR = "/run/current-system/kernel-modules/lib/modules";
+    environment.sessionVariables.MODULE_DIR = "/run/current-system/kernel-modules/lib/modules";
 
   };