diff --git a/libtransmission/peer-io.c b/libtransmission/peer-io.c
index 8ccbf953c..89caf8574 100644
--- a/libtransmission/peer-io.c
+++ b/libtransmission/peer-io.c
@@ -268,7 +268,7 @@ tr_evbuffer_write( tr_peerIo * io, int fd, size_t howmuch )
         evbuffer_drain( buffer, n );
 
     /* keep the iobuf's excess capacity from growing too large */
-    if( buffer->totallen > ( EVBUFFER_LENGTH( buffer ) + 1024 ) ) {
+    if( buffer->totallen > ( EVBUFFER_LENGTH( buffer ) + 4096 ) ) {
         struct evbuffer * swap = evbuffer_new( );
         evbuffer_add( swap, EVBUFFER_DATA( buffer ), EVBUFFER_LENGTH( buffer ) );
         evbuffer_free( buffer );