diff --git a/modules/gui/cursor.nix b/modules/gui/cursor.nix
index 554a042b..7f6c3b00 100644
--- a/modules/gui/cursor.nix
+++ b/modules/gui/cursor.nix
@@ -25,7 +25,7 @@ in {
     config = mkIf cfg.enable {
         environment.sessionVariables = {
             XCURSOR_THEME = "${cfg.name}";
-            XCURSOR_SIZE = "${cfg.size}";
+            XCURSOR_SIZE = "${toString cfg.size}";
         };
 
         home-manager.users.${config'.username} = {