diff --git a/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml b/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
index b922f9f12082..cd8f9e316412 100644
--- a/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
+++ b/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
@@ -1088,6 +1088,15 @@ Superuser created successfully.
           but instead use more of the YAML-specific syntax.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          GNOME desktop environment now enables
+          <literal>QGnomePlatform</literal> as the Qt platform theme,
+          which should avoid crashes when opening file chooser dialogs
+          in Qt apps by using XDG desktop portal. Additionally, it will
+          make the apps fit better visually.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
 </section>
diff --git a/nixos/doc/manual/release-notes/rl-2111.section.md b/nixos/doc/manual/release-notes/rl-2111.section.md
index c7e5afb7d0af..0bc35cdb643a 100644
--- a/nixos/doc/manual/release-notes/rl-2111.section.md
+++ b/nixos/doc/manual/release-notes/rl-2111.section.md
@@ -311,3 +311,5 @@ To be able to access the web UI this port needs to be opened in the firewall.
 - Nginx will use the value of `sslTrustedCertificate` if provided for a virtual host, even if `enableACME` is set. This is useful for providers not using the same certificate to sign OCSP responses and server certificates.
 
 - `lib.formats.yaml`'s `generate` will not generate JSON anymore, but instead use more of the YAML-specific syntax.
+
+- GNOME desktop environment now enables `QGnomePlatform` as the Qt platform theme, which should avoid crashes when opening file chooser dialogs in Qt apps by using XDG desktop portal. Additionally, it will make the apps fit better visually.
diff --git a/nixos/modules/services/x11/desktop-managers/gnome.nix b/nixos/modules/services/x11/desktop-managers/gnome.nix
index b0859321a525..4bc42525906c 100644
--- a/nixos/modules/services/x11/desktop-managers/gnome.nix
+++ b/nixos/modules/services/x11/desktop-managers/gnome.nix
@@ -372,6 +372,13 @@ in
       xdg.portal.enable = true;
       xdg.portal.extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
 
+      # Harmonize Qt5 application style and also make them use the portal for file chooser dialog.
+      qt5 = {
+        enable = mkDefault true;
+        platformTheme = mkDefault "gnome";
+        style = mkDefault "adwaita";
+      };
+
       networking.networkmanager.enable = mkDefault true;
 
       services.xserver.updateDbusEnvironment = true;