diff --git a/quic/core/quic_constants.h b/quic/core/quic_constants.h
index a1126c0..01ec240 100644
--- a/quic/core/quic_constants.h
+++ b/quic/core/quic_constants.h
@@ -120,7 +120,7 @@
 
 // Default minimum delayed ack time, in ms (used only for sender control of ack
 // frequency).
-const uint32_t kDefaultMinAckDelayTimeMs = 1;
+const uint32_t kDefaultMinAckDelayTimeMs = 5;
 
 // Default shift of the ACK delay in the IETF QUIC ACK frame.
 const uint32_t kDefaultAckDelayExponent = 3;