1 files changed, 2 insertions, 0 deletions
diff --git a/src/env.h b/src/env.h
index 73a810dc70..6a3b5944be 100644
--- a/src/env.h
+++ b/src/env.h
@@ -422,6 +422,8 @@ class Environment {
 #undef V
 
  private:
+  static const int kIsolateSlot = 0;
+
   class GCInfo;
   class IsolateData;
   inline explicit Environment(v8::Local<v8::Context> context);