diff --git a/win/share/tile2bmp.c b/win/share/tile2bmp.c
index 522cee762..636cf1396 100644
--- a/win/share/tile2bmp.c
+++ b/win/share/tile2bmp.c
@@ -363,10 +363,3 @@ pixel (*pixels)[TILE_X];
         }
     }
 }
-
-/* nhassert_failed is called when an nhassert's condition is false */
-void nhassert_failed(const char * exp, const char * file, int line)
-{
-    Fprintf(stderr, "NHASSERT(%s) in '%s' at line %d\n", exp, file, line);
-    exit(EXIT_FAILURE);
-}