diff --git a/graphics/nxmu/nxmu_server.c b/graphics/nxmu/nxmu_server.c
index 5a592eec783..4b18a7580d8 100644
--- a/graphics/nxmu/nxmu_server.c
+++ b/graphics/nxmu/nxmu_server.c
@@ -255,8 +255,8 @@ static inline int nxmu_setup(FAR const char *mqname,
   fe->be.bkgd.conn = &fe->conn;
   fe->be.bkgd.be   = (FAR struct nxbe_state_s*)fe;
 
-  fe->be.bkgd.bounds.pt2.x = fe->be.vinfo.xres;
-  fe->be.bkgd.bounds.pt2.y = fe->be.vinfo.yres;
+  fe->be.bkgd.bounds.pt2.x = fe->be.vinfo.xres - 1;
+  fe->be.bkgd.bounds.pt2.y = fe->be.vinfo.yres - 1;
 
   /* Complete initialization of the server state structure.  The
    * window list contains only one element:  The background window
diff --git a/graphics/nxsu/nx_open.c b/graphics/nxsu/nx_open.c
index 15efd3dbebb..901b7710952 100644
--- a/graphics/nxsu/nx_open.c
+++ b/graphics/nxsu/nx_open.c
@@ -139,8 +139,8 @@ static inline int nxsu_setup(FAR struct fb_vtable_s *fb,
   fe->be.bkgd.be = &fe->be;
   fe->be.bkgd.cb = &g_bkgdcb;
 
-  fe->be.bkgd.bounds.pt2.x = fe->be.vinfo.xres;
-  fe->be.bkgd.bounds.pt2.y = fe->be.vinfo.yres;
+  fe->be.bkgd.bounds.pt2.x = fe->be.vinfo.xres - 1;
+  fe->be.bkgd.bounds.pt2.y = fe->be.vinfo.yres - 1;
 
   /* Complete initialization of the server state structure.  The
    * window list contains only one element:  The background window