diff --git a/src/node_data.cpp b/src/node_data.cpp
index da2aefc..8f5422a 100644
--- a/src/node_data.cpp
+++ b/src/node_data.cpp
@@ -13,7 +13,7 @@
 
 namespace YAML {
 namespace detail {
-std::atomic<size_t> node::m_amount{0};
+YAML_CPP_API std::atomic<size_t> node::m_amount{0};
 
 const std::string& node_data::empty_scalar() {
   static const std::string svalue;