diff --git a/src/ripple/json/impl/json_value.cpp b/src/ripple/json/impl/json_value.cpp
index 024ad2c88..6b1445df2 100644
--- a/src/ripple/json/impl/json_value.cpp
+++ b/src/ripple/json/impl/json_value.cpp
@@ -182,6 +182,7 @@ Value::Value(ValueType type) : type_(type), allocated_(0)
     switch (type)
     {
         case nullValue:
+            value_.map_ = nullptr;
             break;
 
         case intValue: