diff --git a/quiche/quic/qbone/bonnet/icmp_reachable.cc b/quiche/quic/qbone/bonnet/icmp_reachable.cc
index 76fd84e..5b6c212 100644
--- a/quiche/quic/qbone/bonnet/icmp_reachable.cc
+++ b/quiche/quic/qbone/bonnet/icmp_reachable.cc
@@ -103,7 +103,7 @@
   }
   alarm_->Set(clock_->Now());
 
-  absl::WriterMutexLock mu(header_lock_);
+  absl::WriterMutexLock mu(&header_lock_);
   icmp_header_.icmp6_type = ICMP6_ECHO_REQUEST;
   icmp_header_.icmp6_code = 0;
 
@@ -134,7 +134,7 @@
       absl::string_view(buffer, size));
 
   auto* header = reinterpret_cast<const icmp6_hdr*>(&buffer);
-  absl::WriterMutexLock mu(header_lock_);
+  absl::WriterMutexLock mu(&header_lock_);
   if (header->icmp6_data32[0] != icmp_header_.icmp6_data32[0]) {
     QUIC_VLOG(2) << "Unexpected response. id: " << header->icmp6_id
                  << " seq: " << header->icmp6_seq
@@ -159,7 +159,7 @@
 }
 
 void IcmpReachable::OnAlarm() {
-  absl::WriterMutexLock mu(header_lock_);
+  absl::WriterMutexLock mu(&header_lock_);
 
   if (end_ < start_) {
     QUIC_VLOG(1) << "Timed out on sequence: " << icmp_header_.icmp6_seq;