diff --git a/qoi.h b/qoi.h
index 2c339f4..d0884c9 100644
--- a/qoi.h
+++ b/qoi.h
@@ -312,7 +312,7 @@ void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels);
 
 #define QOI_MASK_2    0xc0 // 11000000
 
-#define QOI_COLOR_HASH(C) (C.rgba.r * 3 + C.rgba.g * 5 + C.rgba.b * 7)
+#define QOI_COLOR_HASH(C) (C.rgba.r * 3 + C.rgba.g * 5 + C.rgba.b * 7 + C.rgba.a * 11)
 #define QOI_MAGIC \
 	(((unsigned int)'q') << 24 | ((unsigned int)'o') << 16 | \
 	 ((unsigned int)'i') <<  8 | ((unsigned int)'f'))