diff --git a/Siv3D/include/Siv3D/YesNo.hpp b/Siv3D/include/Siv3D/YesNo.hpp
index e6a4fc9a1..1fb2965e4 100644
--- a/Siv3D/include/Siv3D/YesNo.hpp
+++ b/Siv3D/include/Siv3D/YesNo.hpp
@@ -44,6 +44,18 @@ namespace s3d
 			return m_yesNo;
 		}
 
+		[[nodiscard]]
+		constexpr bool operator ==(const YesNo<Tag>& other) const noexcept
+		{
+			return m_yesNo == other.m_yesNo;
+		}
+
+		[[nodiscard]]
+		constexpr bool operator ==(const Helper& other) const noexcept
+		{
+			return m_yesNo == other.yesNo;
+		}
+
 		[[nodiscard]]
 		constexpr bool getBool() const noexcept
 		{