diff --git a/src/env.cc b/src/env.cc
index 6e090679c24baf..7b42ebbea049b9 100644
--- a/src/env.cc
+++ b/src/env.cc
@@ -96,6 +96,7 @@ Environment::Environment(IsolateData* isolate_data,
       trace_sync_io_(false),
       abort_on_uncaught_exception_(false),
       emit_napi_warning_(true),
+      emit_env_nonstring_warning_(true),
       makecallback_cntr_(0),
       should_abort_on_uncaught_toggle_(isolate_, 1),
 #if HAVE_INSPECTOR