diff --git a/Utility/diskfree.c b/Utility/diskfree.c
index 968d2b8b50..b68abd0c47 100644
--- a/Utility/diskfree.c
+++ b/Utility/diskfree.c
@@ -27,7 +27,8 @@
 # include <sys/mount.h>
 # define STATCALL statfs64
 # define STATSTRUCT statfs
-# define UNKNOWN /* temporarily disabled; trying to nail down a build failure */
+# warning free space checking code temporarily disabled due to build failure
+# define UNKNOWN
 #else
 #if defined (__linux__)
 /* This is a POSIX standard, so might also work elsewhere. */