diff --git a/include/valijson/adapters/yaml_cpp_adapter.hpp b/include/valijson/adapters/yaml_cpp_adapter.hpp
index 9065fbc..206e7b3 100644
--- a/include/valijson/adapters/yaml_cpp_adapter.hpp
+++ b/include/valijson/adapters/yaml_cpp_adapter.hpp
@@ -433,7 +433,7 @@ class YamlCppValue
 
     bool isString() const
     {
-        return m_value.isScalar();
+        return m_value.IsScalar();
     }
 
   private: