diff --git a/src/window.rs b/src/window.rs
index 02bdc187..ee43cc8f 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -40,10 +40,15 @@ pub fn window(monitor: gdk::Monitor) -> gtk4::Window {
         window.set_size_request(geometry.width, 0);
 
         if let Some((display, surface)) = x::get_window_x11(&window) {
-            let top: x::c_ulong = 32;
+            let top: x::c_ulong = 32; // XXX arbitrary
             let top_start_x = geometry.x as x::c_ulong;
-            let top_end_x = top_start_x + geometry.width as x::c_ulong;
+            let top_end_x = top_start_x + geometry.width as x::c_ulong - 1;
+
+            println!("{} {}", top_start_x, top_end_x);
+
             unsafe {
+                x::set_position(&display, &surface, top_start_x as _, 0);
+
                 x::change_property(
                     &display,
                     &surface,
diff --git a/src/x.rs b/src/x.rs
index 0970f9b3..74ef039e 100644
--- a/src/x.rs
+++ b/src/x.rs
@@ -3,7 +3,7 @@ use glib::translate::ToGlibPtr;
 use gtk4::{glib, prelude::*};
 use std::{
     ffi::{CString, NulError},
-    os::raw::c_int,
+    os::raw::{c_int, c_long},
 };
 
 pub use std::os::raw::{c_uchar, c_ulong, c_ushort};
@@ -135,3 +135,19 @@ pub unsafe fn change_property<T: XProp>(
         value.nelements(),
     );
 }
+
+pub unsafe fn set_position(
+    display: &gdk4_x11::X11Display,
+    surface: &gdk4_x11::X11Surface,
+    x: c_int,
+    y: c_int,
+) {
+    // XXX check error return value
+    let hints = xlib::XAllocSizeHints();
+    let mut supplied: c_long = 0;
+    xlib::XGetWMNormalHints(display.xdisplay(), surface.xid(), hints, &mut supplied);
+    (*hints).x = x;
+    (*hints).y = y;
+    xlib::XSetWMNormalHints(display.xdisplay(), surface.xid(), hints);
+    xlib::XFree(hints as *mut _);
+}