diff --git a/src/env-inl.h b/src/env-inl.h
index d35f689c2f..ea2d01aa6b 100644
--- a/src/env-inl.h
+++ b/src/env-inl.h
@@ -49,8 +49,7 @@ inline IsolateData::IsolateData(v8::Isolate* isolate, uv_loop_t* event_loop,
             sizeof(StringValue) - 1).ToLocalChecked()),
     PER_ISOLATE_STRING_PROPERTIES(V)
 #undef V
-    isolate_(isolate), event_loop_(event_loop),
-    zero_fill_field_(zero_fill_field) {}
+    event_loop_(event_loop), zero_fill_field_(zero_fill_field) {}
 
 inline uv_loop_t* IsolateData::event_loop() const {
   return event_loop_;
diff --git a/src/env.h b/src/env.h
index 0188a6d3be..a426f60a9b 100644
--- a/src/env.h
+++ b/src/env.h
@@ -330,7 +330,6 @@ class IsolateData {
 #undef VS
 #undef VP
 
-  v8::Isolate* const isolate_;
   uv_loop_t* const event_loop_;
   uint32_t* const zero_fill_field_;