diff --git a/modules/misc/qt.nix b/modules/misc/qt.nix
index c1c413046..9457970c0 100644
--- a/modules/misc/qt.nix
+++ b/modules/misc/qt.nix
@@ -228,13 +228,10 @@ in {
       inherit (config.home) profileDirectory;
       qtVersions = with pkgs; [ qt5 qt6 ];
       makeQtPath = prefix:
-        lib.concatStringsSep ":"
         (map (qt: "${profileDirectory}/${qt.qtbase.${prefix}}") qtVersions);
     in {
-      QT_PLUGIN_PATH = "$QT_PLUGIN_PATH\${QT_PLUGIN_PATH:+:}"
-        + (makeQtPath "qtPluginPrefix");
-      QML2_IMPORT_PATH = "$QML2_IMPORT_PATH\${QML2_IMPORT_PATH:+:}"
-        + (makeQtPath "qtQmlPrefix");
+      QT_PLUGIN_PATH = makeQtPath "qtPluginPrefix";
+      QML2_IMPORT_PATH = makeQtPath "qtQmlPrefix";
     };
 
   in lib.mkIf cfg.enable {
@@ -258,19 +255,14 @@ in {
 
     home = {
       sessionVariables = envVars;
-      # home.sessionVariables does not support setting the same environment
-      # variable to different values.
-      # Since some other modules may set the QT_PLUGIN_PATH or QML2_IMPORT_PATH
-      # to their own value, e.g.: fcitx5, we avoid conflicts by setting
-      # the values in home.sessionVariablesExtra instead.
-      sessionVariablesExtra = ''
-        export QT_PLUGIN_PATH=${envVarsExtra.QT_PLUGIN_PATH}
-        export QML2_IMPORT_PATH=${envVarsExtra.QML2_IMPORT_PATH}
-      '';
+      sessionSearchVariables = envVarsExtra;
     };
 
     # Apply theming also to apps started by systemd.
-    systemd.user.sessionVariables = envVars // envVarsExtra;
+    systemd.user.sessionVariables = envVars // {
+      QT_PLUGIN_PATH = lib.concatStringsSep ":" envVarsExtra.QT_PLUGIN_PATH;
+      QML2_IMPORT_PATH = lib.concatStringsSep ":" envVarsExtra.QML2_IMPORT_PATH;
+    };
 
     home.packages = (lib.findFirst (x: x != [ ]) [ ] [
       (lib.optionals (platformTheme.package != null)