diff --git a/http-push.c b/http-push.c
index f5a92529a8..c06b94d5db 100644
--- a/http-push.c
+++ b/http-push.c
@@ -208,7 +208,8 @@ static void curl_setup_http(CURL *curl, const char *url,
 	curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
 	curl_easy_setopt(curl, CURLOPT_URL, url);
 	curl_easy_setopt(curl, CURLOPT_INFILE, buffer);
-	curl_easy_setopt(curl, CURLOPT_INFILESIZE, buffer->buf.len);
+	curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
+			 cast_size_t_to_curl_off_t(buffer->buf.len));
 	curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
 	curl_easy_setopt(curl, CURLOPT_SEEKFUNCTION, seek_buffer);
 	curl_easy_setopt(curl, CURLOPT_SEEKDATA, buffer);