diff --git a/src/jtk/jtk.c b/src/jtk/jtk.c
index 3562e9c..681b016 100644
--- a/src/jtk/jtk.c
+++ b/src/jtk/jtk.c
@@ -91,7 +91,7 @@ void * jtk_window_create()
     XEvent event;
     Window window = XCreateWindow(g_display,
             RootWindow(g_display, g_vi->screen),
-            0, 0, 800, 800, 0, g_vi->depth, InputOutput, g_vi->visual,
+            0, 0, 800u, 800u, 0u, g_vi->depth, InputOutput, g_vi->visual,
             CWBorderPixel | CWColormap | CWEventMask, &g_swa);
     XMapWindow(g_display, window);
     XIfEvent(g_display, &event, wait_for_notify, (XPointer)window);