diff --git a/src/node.cc b/src/node.cc
index 76e17905a5aaf1..565c965cf9fae6 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -3069,25 +3069,16 @@ void FreeArrayBufferAllocator(ArrayBufferAllocator* allocator) {
 }
 
 
-IsolateData* CreateIsolateData(Isolate* isolate, uv_loop_t* loop) {
-  return new IsolateData(isolate, loop, nullptr);
-}
-
-
-IsolateData* CreateIsolateData(
-    Isolate* isolate,
-    uv_loop_t* loop,
-    MultiIsolatePlatform* platform) {
-  return new IsolateData(isolate, loop, platform);
-}
-
-
 IsolateData* CreateIsolateData(
     Isolate* isolate,
     uv_loop_t* loop,
     MultiIsolatePlatform* platform,
     ArrayBufferAllocator* allocator) {
-  return new IsolateData(isolate, loop, platform, allocator->zero_fill_field());
+  return new IsolateData(
+        isolate,
+        loop,
+        platform,
+        allocator != nullptr ? allocator->zero_fill_field() : nullptr);
 }
 
 
diff --git a/src/node.h b/src/node.h
index ab82be7ac4d30f..74403a6e48d3b8 100644
--- a/src/node.h
+++ b/src/node.h
@@ -257,19 +257,11 @@ NODE_EXTERN v8::Local<v8::Context> NewContext(
 // If `platform` is passed, it will be used to register new Worker instances.
 // It can be `nullptr`, in which case creating new Workers inside of
 // Environments that use this `IsolateData` will not work.
-// TODO(helloshuangzi): switch to default parameters.
-NODE_EXTERN IsolateData* CreateIsolateData(
-    v8::Isolate* isolate,
-    struct uv_loop_s* loop);
-NODE_EXTERN IsolateData* CreateIsolateData(
-    v8::Isolate* isolate,
-    struct uv_loop_s* loop,
-    MultiIsolatePlatform* platform);
 NODE_EXTERN IsolateData* CreateIsolateData(
     v8::Isolate* isolate,
     struct uv_loop_s* loop,
-    MultiIsolatePlatform* platform,
-    ArrayBufferAllocator* allocator);
+    MultiIsolatePlatform* platform = nullptr,
+    ArrayBufferAllocator* allocator = nullptr);
 NODE_EXTERN void FreeIsolateData(IsolateData* isolate_data);
 
 // TODO(addaleax): Add an official variant using STL containers, and move