diff --git a/src/ArduinoJson/Array/JsonArrayConst.hpp b/src/ArduinoJson/Array/JsonArrayConst.hpp
index be7e999b..19c36c7f 100644
--- a/src/ArduinoJson/Array/JsonArrayConst.hpp
+++ b/src/ArduinoJson/Array/JsonArrayConst.hpp
@@ -36,7 +36,7 @@ class JsonArrayConst : public detail::VariantOperators<JsonArrayConst> {
   }
 
   // Creates an unbound reference.
-  JsonArrayConst() : data_(0) {}
+  JsonArrayConst() : data_(0), resources_(0) {}
 
   // INTERNAL USE ONLY
   JsonArrayConst(const detail::ArrayData* data,
diff --git a/src/ArduinoJson/Object/JsonObjectConst.hpp b/src/ArduinoJson/Object/JsonObjectConst.hpp
index 1c9e0270..2d479f94 100644
--- a/src/ArduinoJson/Object/JsonObjectConst.hpp
+++ b/src/ArduinoJson/Object/JsonObjectConst.hpp
@@ -19,7 +19,7 @@ class JsonObjectConst : public detail::VariantOperators<JsonObjectConst> {
   typedef JsonObjectConstIterator iterator;
 
   // Creates an unbound reference.
-  JsonObjectConst() : data_(0) {}
+  JsonObjectConst() : data_(0), resources_(0) {}
 
   // INTERNAL USE ONLY
   JsonObjectConst(const detail::ObjectData* data,