diff --git a/src/impl/realm_coordinator.cpp b/src/impl/realm_coordinator.cpp
index a25a5036..f3d6c1d8 100644
--- a/src/impl/realm_coordinator.cpp
+++ b/src/impl/realm_coordinator.cpp
@@ -22,11 +22,13 @@
 #include "external_commit_helper.hpp"
 #include "object_store.hpp"
 
+#include <unordered_map>
+
 using namespace realm;
 using namespace realm::_impl;
 
 static std::mutex s_coordinator_mutex;
-static std::map<std::string, std::weak_ptr<RealmCoordinator>> s_coordinators_per_path;
+static std::unordered_map<std::string, std::weak_ptr<RealmCoordinator>> s_coordinators_per_path;
 
 std::shared_ptr<RealmCoordinator> RealmCoordinator::get_coordinator(StringData path)
 {