diff --git a/src/KKdLib/image.cpp b/src/KKdLib/image.cpp
index f97b2109..64052f9b 100644
--- a/src/KKdLib/image.cpp
+++ b/src/KKdLib/image.cpp
@@ -10,7 +10,7 @@ static void rgb_to_ycc(vec3& rgb, vec3& ycc);
 static void ycc_apply_col_tone_hue(vec3& ycc, const color_tone* col_tone);
 static void ycc_to_rgb(vec3& ycc, vec3& rgb);
 
-color_tone::color_tone() : hue(), saturation(), value(), contrast(), inverse() {
+color_tone::color_tone() : hue(), saturation(), value(), contrast(), inverse(), reserved() {
 
 }
 
diff --git a/src/KKdLib/image.hpp b/src/KKdLib/image.hpp
index 6cf85674..a6c52027 100644
--- a/src/KKdLib/image.hpp
+++ b/src/KKdLib/image.hpp
@@ -16,6 +16,7 @@ struct color_tone {
     float_t value;
     float_t contrast;
     bool inverse;
+    int32_t reserved[8];
 
     color_tone();
 };