diff --git a/nix/configurations/vanadium/nixos/display.nix b/nix/configurations/vanadium/nixos/display.nix
index 710a61ed..4b3a5eca 100644
--- a/nix/configurations/vanadium/nixos/display.nix
+++ b/nix/configurations/vanadium/nixos/display.nix
@@ -83,7 +83,7 @@
               brightness, # [0..1]
             }:
             singleton "10_ddc_brightness" /* bash */ ''
-              ${lib.getExe pkgs.ddcutil} --model ${modelName} setvcp 10 ${
+              ${lib.getExe pkgs.ddcutil} --model "${modelName}" setvcp 10 ${
                 toString (builtins.floor (brightness * 100))
               }
             '';
@@ -94,7 +94,7 @@
               contrast, # [0..1]
             }:
             singleton "10_ddc_contrast" /* bash */ ''
-              ${lib.getExe pkgs.ddcutil} --model ${modelName} setvcp 12 ${
+              ${lib.getExe pkgs.ddcutil} --model "${modelName}" setvcp 12 ${
                 toString (builtins.floor (contrast * 100))
               }
             '';