diff --git a/src/node_constants.cc b/src/node_constants.cc
index db670789dc06..24416ed4a4d5 100644
--- a/src/node_constants.cc
+++ b/src/node_constants.cc
@@ -1373,11 +1373,7 @@ void CreatePerContextProperties(Local<Object> target,
             FIXED_ONE_BYTE_STRING(isolate, "dlopen"),
             dlopen_constants)
       .Check();
-  os_constants
-      ->Set(env->context(),
-            FIXED_ONE_BYTE_STRING(isolate, "errno"),
-            err_constants)
-      .Check();
+  os_constants->Set(env->context(), env->errno_string(), err_constants).Check();
   os_constants
       ->Set(env->context(),
             FIXED_ONE_BYTE_STRING(isolate, "signals"),
diff --git a/src/node_locks.cc b/src/node_locks.cc
index 9c871569c4d4..26fac6b62c4c 100644
--- a/src/node_locks.cc
+++ b/src/node_locks.cc
@@ -817,10 +817,10 @@ void CreatePerIsolateProperties(IsolateData* isolate_data,
   PropertyAttribute read_only = static_cast<PropertyAttribute>(
       PropertyAttribute::ReadOnly | PropertyAttribute::DontDelete);
   target->Set(FIXED_ONE_BYTE_STRING(isolate, "LOCK_MODE_SHARED"),
-              FIXED_ONE_BYTE_STRING(isolate, "shared"),
+              isolate_data->shared_string(),
               read_only);
   target->Set(FIXED_ONE_BYTE_STRING(isolate, "LOCK_MODE_EXCLUSIVE"),
-              FIXED_ONE_BYTE_STRING(isolate, "exclusive"),
+              isolate_data->exclusive_string(),
               read_only);
   target->Set(FIXED_ONE_BYTE_STRING(isolate, "LOCK_STOLEN_ERROR"),
               FIXED_ONE_BYTE_STRING(isolate, "LOCK_STOLEN"),