diff --git a/src/proto_http.c b/src/proto_http.c
index 720d66b..9b094d7 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -1970,14 +1970,25 @@
 
 /*
  * Selects a compression algorithm depending on the client request.
-*/
-
+ */
 int select_compression_request_header(struct session *s, struct buffer *req)
 {
 	struct http_txn *txn = &s->txn;
 	struct hdr_ctx ctx;
 	struct comp_algo *comp_algo = NULL;
 
+	/* Disable compression for older user agents announcing themselves as "Mozilla/4".
+	 * Note all of them are broken but they are very few and the broken ones are there.
+	 * See http://zoompf.com/2012/02/lose-the-wait-http-compression for more details.
+	 */
+	ctx.idx = 0;
+	if (http_find_header2("User-Agent", 10, req->p, &txn->hdr_idx, &ctx) &&
+	    ctx.vlen >= 9 &&
+	    memcmp(ctx.line + ctx.val, "Mozilla/4", 9) == 0) {
+		s->comp_algo = NULL;
+		return 0;
+	}
+
 	ctx.idx = 0;
 	/* no compression when Cache-Control: no-transform found */
 	while (http_find_header2("Cache-Control", 13, req->p, &txn->hdr_idx, &ctx)) {