diff --git a/netwerk/dns/nsHostRecord.cpp b/netwerk/dns/nsHostRecord.cpp
index 159abb6e548b..114d62dadd83 100644
--- a/netwerk/dns/nsHostRecord.cpp
+++ b/netwerk/dns/nsHostRecord.cpp
@@ -39,6 +39,15 @@ nsHostKey::nsHostKey(const nsACString& aHost, const nsACString& aTrrServer,
       pb(aPb),
       originSuffix(aOriginsuffix) {}
 
+nsHostKey::nsHostKey(const nsHostKey& other)
+    : host(other.host),
+      mTrrServer(other.mTrrServer),
+      type(other.type),
+      flags(other.flags),
+      af(other.af),
+      pb(other.pb),
+      originSuffix(other.originSuffix) {}
+
 bool nsHostKey::operator==(const nsHostKey& other) const {
   return host == other.host && mTrrServer == other.mTrrServer &&
          type == other.type &&
diff --git a/netwerk/dns/nsHostRecord.h b/netwerk/dns/nsHostRecord.h
index c3a73907ae1e..5b193fbdab18 100644
--- a/netwerk/dns/nsHostRecord.h
+++ b/netwerk/dns/nsHostRecord.h
@@ -79,13 +79,15 @@ struct nsHostKey {
   const nsCString host;
   const nsCString mTrrServer;
   uint16_t type = 0;
-  nsIDNSService::DNSFlags flags = nsIDNSService::RESOLVE_DEFAULT_FLAGS;
+  mozilla::Atomic<nsIDNSService::DNSFlags> flags{
+      nsIDNSService::RESOLVE_DEFAULT_FLAGS};
   uint16_t af = 0;
   bool pb = false;
   const nsCString originSuffix;
   explicit nsHostKey(const nsACString& host, const nsACString& aTrrServer,
                      uint16_t type, nsIDNSService::DNSFlags flags, uint16_t af,
                      bool pb, const nsACString& originSuffix);
+  explicit nsHostKey(const nsHostKey& other);
   bool operator==(const nsHostKey& other) const;
   size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
   PLDHashNumber Hash() const;
diff --git a/netwerk/dns/nsHostResolver.cpp b/netwerk/dns/nsHostResolver.cpp
index 4d0e928e860a..6ad32ab0defd 100644
--- a/netwerk/dns/nsHostResolver.cpp
+++ b/netwerk/dns/nsHostResolver.cpp
@@ -1185,7 +1185,8 @@ nsresult nsHostResolver::NameLookup(nsHostRecord* rec,
   }
 
   LOG(("NameLookup: %s effectiveTRRmode: %d flags: %X", rec->host.get(),
-       static_cast<nsIRequest::TRRMode>(rec->mEffectiveTRRMode), rec->flags));
+       static_cast<nsIRequest::TRRMode>(rec->mEffectiveTRRMode),
+       static_cast<uint32_t>(rec->flags)));
 
   if (rec->flags & nsIDNSService::RESOLVE_DISABLE_TRR) {
     rec->RecordReason(TRRSkippedReason::TRR_DISABLED_FLAG);
@@ -2032,8 +2033,9 @@ void nsHostResolver::GetDNSCacheEntries(nsTArray<DNSCacheEntries>* args) {
     }
 
     info.originAttributesSuffix = recordEntry.GetKey().originSuffix;
-    info.flags = nsPrintfCString("%u|0x%x|%u|%d|%s", rec->type, rec->flags,
-                                 rec->af, rec->pb, rec->mTrrServer.get());
+    info.flags = nsPrintfCString("%u|0x%x|%u|%d|%s", rec->type,
+                                 static_cast<uint32_t>(rec->flags), rec->af,
+                                 rec->pb, rec->mTrrServer.get());
 
     args->AppendElement(std::move(info));
   }