diff --git a/nixos/modules/services/x11/gdk-pixbuf.nix b/nixos/modules/services/x11/gdk-pixbuf.nix
index 2105224f92f..9c088e4cc42 100644
--- a/nixos/modules/services/x11/gdk-pixbuf.nix
+++ b/nixos/modules/services/x11/gdk-pixbuf.nix
@@ -21,7 +21,7 @@ in
   # loaders.cache based on that and set the environment variable
   # GDK_PIXBUF_MODULE_FILE to point to it.
   config = lib.mkIf (cfg.modulePackages != []) {
-    environment.variables = {
+    environment.sessionVariables = {
       GDK_PIXBUF_MODULE_FILE = "${loadersCache}";
     };
   };