diff --git a/moo/lib/fmt.c b/moo/lib/fmt.c
index 38a055c..14e22f9 100644
--- a/moo/lib/fmt.c
+++ b/moo/lib/fmt.c
@@ -1233,7 +1233,7 @@ static int fmt_outv (moo_fmtout_t* fmtout, va_list ap)
 			sign = 0;
 			if (lm_flag & LF_J)
 			{
-			#if defined(__GNUC__) && \
+			#if 0 && defined(__GNUC__) && \
 			    (MOO_SIZEOF_UINTMAX_T > MOO_SIZEOF_OOW_T) && \
 			    (MOO_SIZEOF_UINTMAX_T != MOO_SIZEOF_LONG_LONG) && \
 			    (MOO_SIZEOF_UINTMAX_T != MOO_SIZEOF_LONG)