diff --git a/lib/constants.js b/lib/constants.js
index 3336fd8d7fc210..dee46126447e06 100644
--- a/lib/constants.js
+++ b/lib/constants.js
@@ -32,3 +32,4 @@ Object.assign(exports,
               constants.os.signals,
               constants.fs,
               constants.crypto);
+Object.freeze(exports);
diff --git a/test/parallel/test-constants.js b/test/parallel/test-constants.js
index c11935783f861d..945443d8866a2f 100644
--- a/test/parallel/test-constants.js
+++ b/test/parallel/test-constants.js
@@ -24,3 +24,5 @@ assert.ok(binding.crypto);
     }
   });
 });
+
+assert.ok(Object.isFrozen(constants));