diff --git a/http.c b/http.c
index d868d8b3d97cc1a430e1680f2bc5f780b5e66a84..d9d1aad3be468394e39966c0b45e7e101b387b0c 100644
--- a/http.c
+++ b/http.c
@@ -841,6 +841,7 @@ static int http_request(const char *url, struct strbuf *type,
 
 	if (type) {
 		char *t;
+		strbuf_reset(type);
 		curl_easy_getinfo(slot->curl, CURLINFO_CONTENT_TYPE, &t);
 		if (t)
 			strbuf_addstr(type, t);