diff --git a/include/valijson/adapters/yaml_cpp_adapter.hpp b/include/valijson/adapters/yaml_cpp_adapter.hpp
index 362d471..9065fbc 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 true;
+        return m_value.isScalar();
     }
 
   private: