diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index 3a7fd8e..2197efb 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -425,7 +425,7 @@ void FastWriter::writeValue(const Value& value) {
 // //////////////////////////////////////////////////////////////////
 
 StyledWriter::StyledWriter()
-    : rightMargin_(74), indentSize_(3), addChildValues_() {}
+    : rightMargin_(74), indentSize_(3), addChildValues_(false) {}
 
 JSONCPP_STRING StyledWriter::write(const Value& root) {
   document_.clear();