diff --git a/src/ckpool.h b/src/ckpool.h
index d247bdd0..0f00e926 100644
--- a/src/ckpool.h
+++ b/src/ckpool.h
@@ -82,7 +82,7 @@ struct connsock {
 	int buflen;
 	int bufsize;
 	int rcvbufsiz;
-	bool rcvbufsiz_setfail;
+	int sendbufsiz;
 
 	ckpool_t *ckp;
 	/* Semaphore used to serialise request/responses */
diff --git a/src/generator.c b/src/generator.c
index 3a1390ed..f5fa7f2d 100644
--- a/src/generator.c
+++ b/src/generator.c
@@ -445,6 +445,12 @@ static bool connect_proxy(ckpool_t *ckp, connsock_t *cs, proxy_instance_t *proxy
 				cs->fd, proxy->epfd);
 			return false;
 		}
+	} else {
+		/* We want large send/recv buffers on passthroughs */
+		if (!ckp->rmem_warn)
+			cs->rcvbufsiz = set_recvbufsize(ckp, cs->fd, 1048576);
+		if (!ckp->wmem_warn)
+			cs->sendbufsiz = set_sendbufsize(ckp, cs->fd, 1048576);
 	}
 	return true;
 }