--- a/media/mtransport/nr_socket_prsock.cpp
+++ b/media/mtransport/nr_socket_prsock.cpp
@@ -1207,16 +1207,17 @@ nsresult NrUdpSocketIpc::SetAddress() {
   nsAutoCString address;
   if(NS_FAILED(socket_child_->GetLocalAddress(address))) {
     err_ = true;
     MOZ_ASSERT(false, "Failed to get local address");
     return NS_OK;
   }
 
   PRNetAddr praddr;
+  memset(&praddr, 0, sizeof(PRNetAddr));
   if (PR_SUCCESS != PR_InitializeNetAddr(PR_IpAddrAny, port, &praddr)) {
     err_ = true;
     MOZ_ASSERT(false, "Failed to set port in PRNetAddr");
     return NS_OK;
   }
 
   if (PR_SUCCESS != PR_StringToNetAddr(address.BeginReading(), &praddr)) {
     err_ = true;