1 files changed, 3 insertions, 1 deletions
diff --git a/buffer.c b/buffer.c
index abf3ab7..f483d53 100644
--- a/buffer.c
+++ b/buffer.c
@@ -118,8 +118,10 @@ bool buffer_vprintf(Buffer *buf, const char *fmt, va_list ap) {
 	va_list ap_save;
 	va_copy(ap_save, ap);
 	int len = vsnprintf(NULL, 0, fmt, ap);
-	if (len == -1 || !buffer_grow(buf, len+1))
+	if (len == -1 || !buffer_grow(buf, len+1)) {
+		va_end(ap_save);
 		return false;
+	}
 	bool ret = vsnprintf(buf->data, len+1, fmt, ap_save) == len;
 	if (ret)
 		buf->len = len+1;