diff --git a/libc/stdio/vasprintf.c b/libc/stdio/vasprintf.c
index 54c46b3..1630ccb 100644
--- a/libc/stdio/vasprintf.c
+++ b/libc/stdio/vasprintf.c
@@ -37,7 +37,7 @@
 	if (f._bf._base == NULL)
 		goto err;
 	f._bf._size = f._w = 127;		/* Leave room for the NUL */
-	ret = vfprintf(&f, fmt, ap);
+	ret = __vfprintf(&f, fmt, ap);
 	if (ret == -1)
 		goto err;
 	*f._p = '\0';