diff --git a/examples/nx/nx_internal.h b/examples/nx/nx_internal.h
index 2f41fba42..96e84a958 100644
--- a/examples/nx/nx_internal.h
+++ b/examples/nx/nx_internal.h
@@ -264,8 +264,8 @@ extern const struct nx_callback_s g_tbcb;
 
 /* The screen resolution */
 
-nxgl_coord_t g_xres;
-nxgl_coord_t g_yres;
+extern nxgl_coord_t g_xres;
+extern nxgl_coord_t g_yres;
 
 extern bool b_haveresolution;
 #ifdef CONFIG_NX_MULTIUSER