diff -Naur ft2demos-2.5.1/src/ttdebug.c ft2demos-2.5.1.new/src/ttdebug.c
--- ft2demos-2.5.1/src/ttdebug.c	2013-11-05 12:31:57.452397772 +0100
+++ ft2demos-2.5.1.new/src/ttdebug.c	2013-12-08 23:40:31.756506259 +0100
@@ -1905,11 +1905,11 @@
 
       FT_Library_Version( library, &major, &minor, &patch );
 
-      offset = snprintf( version_string, 64 + 1,
+      offset = snprintf( version_string, sizeof(version_string),
                          "ttdebug (FreeType) %d.%d",
                          major, minor );
       if ( patch )
-        offset = snprintf( version_string + offset, 64 + 1 - offset,
+        offset = snprintf( version_string + offset, sizeof(version_string) - offset,
                            ".%d",
                            patch );
     }