diff --git a/src/backend/wayland/wl_handlers.c b/src/backend/wayland/wl_handlers.c
index 923d750..c95e088 100644
--- a/src/backend/wayland/wl_handlers.c
+++ b/src/backend/wayland/wl_handlers.c
@@ -329,8 +329,27 @@ handle_pointer_button(struct wl_listener *listener, void *data)
      * wlr_seat_pointer_notify_button to be a no-op. */
     wl_update_pointer_focus(ev->time_msec);
 
-    wlr_seat_pointer_notify_button(wl_state.seat, ev->time_msec,
-                                   ev->button, ev->state);
+    /* Suppress forwarding to the client when the WM modifier key is held
+     * on a button press over a client surface.  In this case frameMouseDown
+     * will handle the event (move or resize), and the app must not see it. */
+    Bool forward_to_client = True;
+    if (ev->state == WLR_BUTTON_PRESSED && wl_state.seat) {
+        struct wlr_keyboard *_kb = wl_state.seat->keyboard_state.keyboard;
+        unsigned int _mods = _kb ? _kb->modifiers.depressed : 0;
+        if (_mods & wPreferences.modifier_mask) {
+            double _sx, _sy;
+            struct wl_toplevel_view *_tv = NULL;
+            struct wlr_surface *_surf = view_surface_at(
+                wl_state.pointer_x, wl_state.pointer_y, &_sx, &_sy, &_tv);
+            if (_surf && _tv)
+                forward_to_client = False;
+        }
+    }
+
+    if (forward_to_client) {
+        wlr_seat_pointer_notify_button(wl_state.seat, ev->time_msec,
+                                       ev->button, ev->state);
+    }
     wlr_seat_pointer_notify_frame(wl_state.seat);
 }