diff --git a/examples/bmp-parser.csn b/examples/bmp-parser.csn
index 119c24d..5afa5e4 100644
--- a/examples/bmp-parser.csn
+++ b/examples/bmp-parser.csn
@@ -49,9 +49,9 @@
     (ld x 0)(ld y h)(ld dy -1)(dec y)
     
     ; test if height is negative
-    (and r0 h 0x80000000 
+    (and r0 h 0x8000_0000
         (nz? 
-            (or h 0xFFFFFFFF_00000000) ; sign extend
+            (se32 h) ; sign extend to u64
             (mul h -1)
             (ld dy 1) ; going downward
             (ld y 0)