diff --git a/src/ZmqReceiver.cpp b/src/ZmqReceiver.cpp
index 9799651..4f8cd6b 100644
--- a/src/ZmqReceiver.cpp
+++ b/src/ZmqReceiver.cpp
@@ -202,7 +202,7 @@ void copy_value_to_buffer(char* buffer, const size_t offset, const pt::ptree& js
     }
 }
 
-shared_ptr<char> ZmqReceiver::get_value_from_json(const pt::ptree& json_header, const string& name, const HeaderDataType& header_data_type) const
+shared_ptr<char> get_value_from_json(const pt::ptree& json_header, const string& name, const HeaderDataType& header_data_type)
 {
     char* buffer = new char[header_data_type.value_bytes_size * header_data_type.value_shape];
 
@@ -214,7 +214,7 @@ shared_ptr<char> ZmqReceiver::get_value_from_json(const pt::ptree& json_header,
 
         for (const auto& item : json_header.get_child(name)) {
             auto offset = index * header_data_type.value_bytes_size;
-            copy_value_to_buffer(buffer, offset, json_header.get_child(name), header_data_type);
+            copy_value_to_buffer(buffer, offset, item.second, header_data_type);
 
             ++index;
         }
diff --git a/src/ZmqReceiver.hpp b/src/ZmqReceiver.hpp
index 836c738..4d9ad9b 100644
--- a/src/ZmqReceiver.hpp
+++ b/src/ZmqReceiver.hpp
@@ -23,7 +23,12 @@ struct HeaderDataType
 };
 
 size_t get_type_byte_size(const std::string& type);
-void copy_value_to_buffer(const char* buffer, size_t offset, const boost::property_tree::ptree& json_value, const HeaderDataType& header_data_type);
+
+void copy_value_to_buffer(const char* buffer, size_t offset, const boost::property_tree::ptree& json_value, 
+    const HeaderDataType& header_data_type);
+
+std::shared_ptr<char> get_value_from_json(const boost::property_tree::ptree& json_header, 
+    const std::string& name, const HeaderDataType& header_data_type);
 
 class ZmqReceiver
 {
@@ -40,8 +45,7 @@ class ZmqReceiver
 
     std::shared_ptr<FrameMetadata> read_json_header(const std::string& header);
     
-    std::shared_ptr<char> get_value_from_json(const boost::property_tree::ptree& json_header, 
-        const std::string& name, const HeaderDataType& header_data_type) const;
+    
 
     public:
         ZmqReceiver(const std::string& connect_address, const int n_io_threads, const int receive_timeout,