diff --git a/setup.sh b/setup.sh
index d37489d..4da3e3c 100755
--- a/setup.sh
+++ b/setup.sh
@@ -647,11 +647,17 @@ info "Tailoring toolkits for DE=$DE / TWM=$TWM..."
 #   right flavor   -> nothing to do
 #   OTHER flavor   -> dnf SWAP to the wanted one (atomic: on failure the
 #                     existing flavor stays, which is the safe outcome)
-if [[ "$DE" == "plasma" || "$TWM" == "hyprland" ]]; then
-    peazip_wanted="peazip-qt6"
-else
-    # XFCE, GNOME, Niri, MangoWC, chadwm: lightweight/generic toolkits
+#
+# Flavor choice: PeaZip's GTK3 build is ALPHA (Lazarus GTK3 widgetset) —
+# upstream ships it "for test purpose only", and it renders broken on
+# non-GTK Wayland compositors (YuKu-proven on niri: broken UI until a
+# manual swap to qt6). GTK3 therefore only for genuine GTK stacks
+# (GNOME, XFCE); Qt6 everywhere else — including niri/MangoWC/Hyprland
+# and chadwm (Qt6 handles both Wayland and X11 cleanly).
+if [[ "$DE" == "gnome" || "$DE" == "xfce" ]]; then
     peazip_wanted="peazip-gtk3"
+else
+    peazip_wanted="peazip-qt6"
 fi
 peazip_existing=""
 local_v=""