diff --git a/src/manage.c b/src/manage.c
index 8dcc17a2..5512602e 100644
--- a/src/manage.c
+++ b/src/manage.c
@@ -419,6 +419,17 @@ void manage_window(xcb_window_t window, xcb_get_window_attributes_cookie_t cooki
     if (cwindow->dock)
         want_floating = false;
 
+    /* Plasma windows set their geometry in WM_SIZE_HINTS. */
+    if ((wm_size_hints.flags & XCB_ICCCM_SIZE_HINT_US_POSITION || wm_size_hints.flags & XCB_ICCCM_SIZE_HINT_P_POSITION) &&
+        (wm_size_hints.flags & XCB_ICCCM_SIZE_HINT_US_SIZE || wm_size_hints.flags & XCB_ICCCM_SIZE_HINT_P_SIZE)) {
+        DLOG("We are setting geometry according to wm_size_hints x=%d y=%d w=%d h=%d\n",
+             wm_size_hints.x, wm_size_hints.y, wm_size_hints.width, wm_size_hints.height);
+        geom->x = wm_size_hints.x;
+        geom->y = wm_size_hints.y;
+        geom->width = wm_size_hints.width;
+        geom->height = wm_size_hints.height;
+    }
+
     /* Store the requested geometry. The width/height gets raised to at least
      * 75x50 when entering floating mode, which is the minimum size for a
      * window to be useful (smaller windows are usually overlays/toolbars/…