diff --git a/stand/libsa/printf.c b/stand/libsa/printf.c
index 34e92b1dfe0f..a522c2c3e71f 100644
--- a/stand/libsa/printf.c
+++ b/stand/libsa/printf.c
@@ -121,6 +121,34 @@ snprint_func(int ch, void *arg)
 	pbuf->size--;
 }
 
+int
+asprintf(char **buf, const char *cfmt, ...)
+{
+	int retval;
+	struct print_buf arg;
+	va_list ap;
+
+	*buf = NULL;
+	va_start(ap, cfmt);
+	retval = kvprintf(cfmt, NULL, NULL, 10, ap);
+	va_end(ap);
+	if (retval <= 0)
+		return (-1);
+
+	arg.size = retval + 1;
+	arg.buf = *buf = malloc(arg.size);
+	if (*buf == NULL)
+		return (-1);
+
+	va_start(ap, cfmt);
+	retval = kvprintf(cfmt, &snprint_func, &arg, 10, ap);
+	va_end(ap);
+
+	if (arg.size >= 1)
+		*(arg.buf)++ = 0;
+	return (retval);
+}
+
 int
 snprintf(char *buf, size_t size, const char *cfmt, ...)
 {
diff --git a/stand/libsa/stand.h b/stand/libsa/stand.h
index aba213c3b934..09512b6bddc0 100644
--- a/stand/libsa/stand.h
+++ b/stand/libsa/stand.h
@@ -268,6 +268,7 @@ extern void	*reallocf(void *ptr, size_t size);
 extern void	mallocstats(void);
 
 extern int	printf(const char *fmt, ...) __printflike(1, 2);
+extern int	asprintf(char **buf, const char *cfmt, ...) __printflike(2, 3);
 extern int	sprintf(char *buf, const char *cfmt, ...) __printflike(2, 3);
 extern int	snprintf(char *buf, size_t size, const char *cfmt, ...) __printflike(3, 4);
 extern int	vprintf(const char *fmt, __va_list);