diff --git a/router/java/src/net/i2p/router/transport/udp/ACKSender.java b/router/java/src/net/i2p/router/transport/udp/ACKSender.java
index 6f01a3f625..9c5376b89c 100644
--- a/router/java/src/net/i2p/router/transport/udp/ACKSender.java
+++ b/router/java/src/net/i2p/router/transport/udp/ACKSender.java
@@ -28,7 +28,7 @@ class ACKSender implements Runnable {
     private static final long POISON_PS = -9999999999l;
     
     /** how frequently do we want to send ACKs to a peer? */
-    static final int ACK_FREQUENCY = 250;
+    static final int ACK_FREQUENCY = 150;
     
     public ACKSender(RouterContext ctx, UDPTransport transport) {
         _context = ctx;