diff --git a/twpp/capability.hpp b/twpp/capability.hpp
index 886a00a8..7f341b6a 100644
--- a/twpp/capability.hpp
+++ b/twpp/capability.hpp
@@ -118,7 +118,7 @@ template<> struct Cap<CapType::IImageFilter> {static constexpr const Type twty =
 template<> struct Cap<CapType::IImageMerge> {static constexpr const Type twty = Type::UInt16; typedef ImageMerge DataType;};
 template<> struct Cap<CapType::IImageMergeHeightThreshold> {static constexpr const Type twty = Type::Fix32; typedef Fix32 DataType;};
 template<> struct Cap<CapType::IJpegPixelType> {static constexpr const Type twty = Type::UInt16; typedef PixelType DataType;};
-template<> struct Cap<CapType::IJpegQuality> {static constexpr const Type twty = Type::Int16; typedef JpegQuality DataType;};  // JpegQuality or 0-100
+template<> struct Cap<CapType::IJpegQuality> {static constexpr const Type twty = Type::UInt16; typedef JpegQuality DataType;};  // JpegQuality or 0-100
 template<> struct Cap<CapType::IJpegSubSampling> {static constexpr const Type twty = Type::UInt16; typedef JpegSubSampling DataType;};
 template<> struct Cap<CapType::ILampState> {static constexpr const Type twty = Type::Bool; typedef Bool DataType;};
 template<> struct Cap<CapType::ILightPath> {static constexpr const Type twty = Type::UInt16; typedef LightPath DataType;};