diff --git a/libqpdf/JSONHandler.cc b/libqpdf/JSONHandler.cc
index b5c7c35d..d6021935 100644
--- a/libqpdf/JSONHandler.cc
+++ b/libqpdf/JSONHandler.cc
@@ -4,11 +4,29 @@
 #include <qpdf/QTC.hh>
 #include <qpdf/QUtil.hh>
 
+class JSONHandler::Members
+{
+    friend class JSONHandler;
+
+  public:
+    ~Members() = default;
+
+  private:
+    Members() = default;
+    Members(Members const&) = delete;
+
+    Handlers h;
+};
+
 JSONHandler::JSONHandler() :
     m(new Members())
 {
 }
 
+JSONHandler::~JSONHandler()
+{
+}
+
 void
 JSONHandler::usage(std::string const& msg)
 {
diff --git a/libqpdf/qpdf/JSONHandler.hh b/libqpdf/qpdf/JSONHandler.hh
index 8fdcaee6..6439ff12 100644
--- a/libqpdf/qpdf/JSONHandler.hh
+++ b/libqpdf/qpdf/JSONHandler.hh
@@ -16,7 +16,7 @@ class JSONHandler
   public:
     // A QPDFUsage exception is thrown if there are any errors validating the JSON object.
     JSONHandler();
-    ~JSONHandler() = default;
+    ~JSONHandler();
 
     // Based on the type of handler, expect the object to be of a certain type. QPDFUsage is thrown
     // otherwise. Multiple handlers may be registered, which allows the object to be of various
@@ -55,49 +55,26 @@ class JSONHandler
 
     struct Handlers
     {
-        Handlers() :
-            any_handler(nullptr),
-            null_handler(nullptr),
-            string_handler(nullptr),
-            number_handler(nullptr),
-            bool_handler(nullptr),
-            dict_start_handler(nullptr),
-            dict_end_handler(nullptr),
-            array_start_handler(nullptr),
-            array_end_handler(nullptr),
-            final_handler(nullptr)
-        {
-        }
+        Handlers() = default;
 
-        json_handler_t any_handler;
-        void_handler_t null_handler;
-        string_handler_t string_handler;
-        string_handler_t number_handler;
-        bool_handler_t bool_handler;
-        json_handler_t dict_start_handler;
-        void_handler_t dict_end_handler;
-        json_handler_t array_start_handler;
-        void_handler_t array_end_handler;
-        void_handler_t final_handler;
+        json_handler_t any_handler{nullptr};
+        void_handler_t null_handler{nullptr};
+        string_handler_t string_handler{nullptr};
+        string_handler_t number_handler{nullptr};
+        bool_handler_t bool_handler{nullptr};
+        json_handler_t dict_start_handler{nullptr};
+        void_handler_t dict_end_handler{nullptr};
+        json_handler_t array_start_handler{nullptr};
+        void_handler_t array_end_handler{nullptr};
+        void_handler_t final_handler{nullptr};
         std::map<std::string, std::shared_ptr<JSONHandler>> dict_handlers;
         std::shared_ptr<JSONHandler> fallback_dict_handler;
         std::shared_ptr<JSONHandler> array_item_handler;
     };
 
-    class Members
-    {
-        friend class JSONHandler;
+    class Members;
 
-      public:
-        ~Members() = default;
-
-      private:
-        Members() = default;
-        Members(Members const&) = delete;
-
-        Handlers h;
-    };
-    std::shared_ptr<Members> m;
+    std::unique_ptr<Members> m;
 };
 
 #endif // JSONHANDLER_HH