1 files changed, 3 insertions, 5 deletions

diff --git a/lib/libc/stdlib/strfmon.c b/lib/libc/stdlib/strfmon.c
index b82797dc6d1e..689c78b8bff3 100644
--- a/lib/libc/stdlib/strfmon.c
+++ b/lib/libc/stdlib/strfmon.c
@@ -526,7 +526,6 @@ __format_grouped_double(double value, int *flags,
 	char		*rslt;
 	char		*avalue;
 	int		avalue_size;
-	char		fmt[32];
 
 	size_t		bufsize;
 	char		*bufend;
@@ -567,14 +566,13 @@ __format_grouped_double(double value, int *flags,
 		left_prec += get_groups(left_prec, grouping);
 
 	/* convert to string */
-	snprintf(fmt, sizeof(fmt), "%%%d.%df", left_prec + right_prec + 1,
-	    right_prec);
-	avalue_size = asprintf(&avalue, fmt, value);
+	avalue_size = asprintf(&avalue, "%*.*f", left_prec + right_prec + 1,
+	    right_prec, value);
 	if (avalue_size < 0)
 		return (NULL);
 
 	/* make sure that we've enough space for result string */
-	bufsize = strlen(avalue)*2+1;
+	bufsize = avalue_size * 2 + 1;
 	rslt = calloc(1, bufsize);
 	if (rslt == NULL) {
 		free(avalue);