diff --git a/pkgs/applications/graphics/monado/default.nix b/pkgs/applications/graphics/monado/default.nix
index 95889ffff4d5..4cbd7a8f00c9 100644
--- a/pkgs/applications/graphics/monado/default.nix
+++ b/pkgs/applications/graphics/monado/default.nix
@@ -79,11 +79,11 @@ stdenv.mkDerivation {
   ];
 
   cmakeFlags = [
-    "-DXRT_FEATURE_SERVICE=${if serviceSupport then "ON" else "OFF"}"
-    "-DXRT_OPENXR_INSTALL_ABSOLUTE_RUNTIME_PATH=ON"
-    "-DXRT_HAVE_TRACY=ON"
-    "-DXRT_FEATURE_TRACING=ON"
-    "-DXRT_HAVE_STEAM=ON"
+    (lib.cmakeBool "XRT_FEATURE_SERVICE" serviceSupport)
+    (lib.cmakeBool "XRT_OPENXR_INSTALL_ABSOLUTE_RUNTIME_PATH" true)
+    (lib.cmakeBool "XRT_HAVE_TRACY" true)
+    (lib.cmakeBool "XRT_FEATURE_TRACING" true)
+    (lib.cmakeBool "XRT_HAVE_STEAM" true)
   ];
 
   buildInputs = [