diff --git a/libc/stdio/sprintf.c b/libc/stdio/sprintf.c
index 67f924b..3cf7952 100644
--- a/libc/stdio/sprintf.c
+++ b/libc/stdio/sprintf.c
@@ -56,7 +56,7 @@
 	f._bf._base = f._p = (unsigned char *)str;
 	f._bf._size = f._w = INT_MAX;
 	va_start(ap, fmt);
-	ret = vfprintf(&f, fmt, ap);
+	ret = __vfprintf(&f, fmt, ap);
 	va_end(ap);
 	*f._p = '\0';
 	return (ret);