diff --git a/src/env.cc b/src/env.cc
index 4a25309449c8c7..0befcbd6c25570 100644
--- a/src/env.cc
+++ b/src/env.cc
@@ -501,6 +501,7 @@ void IsolateData::CreateProperties() {
   binding::CreateInternalBindingTemplates(this);
 
   contextify::ContextifyContext::InitializeGlobalTemplates(this);
+  CreateEnvProxyTemplate(this);
 }
 
 constexpr uint16_t kDefaultCppGCEmebdderID = 0x90de;
diff --git a/src/node_env_var.cc b/src/node_env_var.cc
index 94936ea1c2bd22..bce7ae07214ddf 100644
--- a/src/node_env_var.cc
+++ b/src/node_env_var.cc
@@ -456,7 +456,8 @@ static void EnvDefiner(Local<Name> property,
   }
 }
 
-void CreateEnvProxyTemplate(Isolate* isolate, IsolateData* isolate_data) {
+void CreateEnvProxyTemplate(IsolateData* isolate_data) {
+  Isolate* isolate = isolate_data->isolate();
   HandleScope scope(isolate);
   if (!isolate_data->env_proxy_template().IsEmpty()) return;
   Local<FunctionTemplate> env_proxy_ctor_template =
diff --git a/src/node_process.h b/src/node_process.h
index c911b3ddd7b78f..ee6e6a81676bd6 100644
--- a/src/node_process.h
+++ b/src/node_process.h
@@ -15,7 +15,7 @@ class MemoryTracker;
 class ExternalReferenceRegistry;
 class Realm;
 
-void CreateEnvProxyTemplate(v8::Isolate* isolate, IsolateData* isolate_data);
+void CreateEnvProxyTemplate(IsolateData* isolate_data);
 
 // Most of the time, it's best to use `console.error` to write
 // to the process.stderr stream.  However, in some cases, such as
diff --git a/src/node_realm.cc b/src/node_realm.cc
index 7101b23e347c7c..23fb6bd55213ee 100644
--- a/src/node_realm.cc
+++ b/src/node_realm.cc
@@ -344,10 +344,11 @@ MaybeLocal<Value> PrincipalRealm::BootstrapRealm() {
     return MaybeLocal<Value>();
   }
 
+  // Setup process.env proxy.
   Local<String> env_string = FIXED_ONE_BYTE_STRING(isolate_, "env");
   Local<Object> env_proxy;
-  CreateEnvProxyTemplate(isolate_, env_->isolate_data());
-  if (!env_->env_proxy_template()->NewInstance(context()).ToLocal(&env_proxy) ||
+  if (!isolate_data()->env_proxy_template()->NewInstance(context()).ToLocal(
+          &env_proxy) ||
       process_object()->Set(context(), env_string, env_proxy).IsNothing()) {
     return MaybeLocal<Value>();
   }