diff --git a/src/env-inl.h b/src/env-inl.h
index 615d4b95a543bc..6d7520dab0acc8 100644
--- a/src/env-inl.h
+++ b/src/env-inl.h
@@ -566,7 +566,8 @@ 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 1fee31a9479e2a..6459eb90a965e1 100644
--- a/src/env.h
+++ b/src/env.h
@@ -39,7 +39,6 @@
 #include "node_http2_state.h"
 
 #include <list>
-#include <map>
 #include <stdint.h>
 #include <vector>
 #include <unordered_map>
@@ -642,7 +641,7 @@ class Environment {
   inline void set_fs_stats_field_array(double* fields);
 
   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();
 
   inline void ThrowError(const char* errmsg);
   inline void ThrowTypeError(const char* errmsg);
@@ -774,7 +773,7 @@ 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_;