diff --git a/talk/media/sctp/sctpdataengine.cc b/talk/media/sctp/sctpdataengine.cc
index eff18a88fa..8b74680fe8 100644
--- a/talk/media/sctp/sctpdataengine.cc
+++ b/talk/media/sctp/sctpdataengine.cc
@@ -105,9 +105,9 @@ namespace cricket {
 typedef rtc::ScopedMessageData<SctpInboundPacket> InboundPacketMessage;
 typedef rtc::ScopedMessageData<rtc::Buffer> OutboundPacketMessage;
 
-// TODO(ldixon): Find where this is defined, and also check is Sctp really
-// respects this.
-static const size_t kSctpMtu = 1280;
+// The biggest SCTP packet.  Starting from a 'safe' wire MTU value of 1280,
+// take off 80 bytes for DTLS/TURN/TCP/IP overhead.
+static const size_t kSctpMtu = 1200;
 
 enum {
   MSG_SCTPINBOUNDPACKET = 1,   // MessageData is SctpInboundPacket
@@ -378,6 +378,18 @@ bool SctpDataMediaChannel::OpenSctpSocket() {
     return false;
   }
 
+  // Disable MTU discovery
+  struct sctp_paddrparams params;
+  params.spp_assoc_id = 0;
+  params.spp_flags = SPP_PMTUD_DISABLE;
+  params.spp_pathmtu = kSctpMtu;
+  if (usrsctp_setsockopt(sock_, IPPROTO_SCTP, SCTP_PEER_ADDR_PARAMS, &params,
+      sizeof(params))) {
+    LOG_ERRNO(LS_ERROR) << debug_name_
+                        << "Failed to set SCTP_PEER_ADDR_PARAMS.";
+    return false;
+  }
+
   // Subscribe to SCTP event notifications.
   int event_types[] = {SCTP_ASSOC_CHANGE,
                        SCTP_PEER_ADDR_CHANGE,