diff --git a/src/env-inl.h b/src/env-inl.h
index bc800f6d5c9642..96e88b5c116adb 100644
--- a/src/env-inl.h
+++ b/src/env-inl.h
@@ -531,7 +531,8 @@ inline performance::performance_state* Environment::performance_state() {
   return performance_state_.get();
 }
 
-inline std::map<std::string, uint64_t>* Environment::performance_marks() {
+inline std::unordered_map<std::string, uint64_t>*
+    Environment::performance_marks() {
   return &performance_marks_;
 }
 
diff --git a/src/env.h b/src/env.h
index 9c5ba966f4f514..6a5fbd0587f384 100644
--- a/src/env.h
+++ b/src/env.h
@@ -38,7 +38,6 @@
 #include "node_http2_state.h"
 
 #include <list>
-#include <map>
 #include <stdint.h>
 #include <vector>
 #include <unordered_map>
@@ -646,7 +645,7 @@ class Environment {
       file_handle_read_wrap_freelist();
 
   inline performance::performance_state* performance_state();
-  inline std::map<std::string, uint64_t>* performance_marks();
+  inline std::unordered_map<std::string, uint64_t>* performance_marks();
 
   void CollectExceptionInfo(v8::Local<v8::Value> context,
                             int errorno,
@@ -795,7 +794,7 @@ class Environment {
   int should_not_abort_scope_counter_ = 0;
 
   std::unique_ptr<performance::performance_state> performance_state_;
-  std::map<std::string, uint64_t> performance_marks_;
+  std::unordered_map<std::string, uint64_t> performance_marks_;
 
 #if HAVE_INSPECTOR
   std::unique_ptr<inspector::Agent> inspector_agent_;