diff --git a/src/lib_json/json_reader.cpp b/src/lib_json/json_reader.cpp
index a2b7885..ade7890 100644
--- a/src/lib_json/json_reader.cpp
+++ b/src/lib_json/json_reader.cpp
@@ -1031,7 +1031,9 @@ private:
 
 OurReader::OurReader(OurFeatures const& features)
     : errors_(), document_(), begin_(), end_(), current_(), lastValueEnd_(),
-      lastValue_(), commentsBefore_(), features_(features), collectComments_() {
+      lastValue_(), commentsBefore_(),
+      stackDepth_(0),
+      features_(features), collectComments_() {
 }
 
 bool OurReader::parse(const char* beginDoc,