diff --git a/pkgs/applications/networking/instant-messengers/viber/default.nix b/pkgs/applications/networking/instant-messengers/viber/default.nix
index 521e24360083..884bd0942db1 100644
--- a/pkgs/applications/networking/instant-messengers/viber/default.nix
+++ b/pkgs/applications/networking/instant-messengers/viber/default.nix
@@ -80,6 +80,7 @@ stdenv.mkDerivation {
 
     # qt.conf is not working, so override everything using environment variables
     wrapProgram $out/opt/viber/Viber \
+      --set QT_QPA_PLATFORM "xcb" \
       --set QT_PLUGIN_PATH "$out/opt/viber/plugins" \
       --set QT_XKB_CONFIG_ROOT "${xorg.xkeyboardconfig}/share/X11/xkb" \
       --set QTCOMPOSE "${xorg.libX11.out}/share/X11/locale" \