diff --git a/modules/home-manager/kvantum.nix b/modules/home-manager/kvantum.nix
index 8809ea7..b73c0c6 100644
--- a/modules/home-manager/kvantum.nix
+++ b/modules/home-manager/kvantum.nix
@@ -39,6 +39,10 @@ in
         ];
         message = ''`qt.style.name` must be `"kvantum"` to use `qt.style.catppuccin`'';
       }
+      {
+        assertion = lib.elem (config.qt.platformTheme.name or null) [ "kvantum" ];
+        message = ''`qt.platformTheme.name` must be set to `"kvantum"` to use `qt.style.catppuccin`'';
+      }
     ];
 
     xdg.configFile = {
diff --git a/test.nix b/test.nix
index 6b73ce8..86eccfa 100644
--- a/test.nix
+++ b/test.nix
@@ -121,6 +121,7 @@ testers.runNixOSTest {
         };
 
         qt = enable // {
+          platformTheme.name = "kvantum";
           style.name = "kvantum";
         };