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--- src/lcms2_internal.h
+++ src/lcms2_internal.h
@@ -93,7 +93,7 @@
// A fast way to convert from/to 16 <-> 8 bits
#define FROM_8_TO_16(rgb) (cmsUInt16Number) ((((cmsUInt16Number) (rgb)) << 8)|(rgb))
-#define FROM_16_TO_8(rgb) (cmsUInt8Number) ((((rgb) * 65281 + 8388608) >> 24) & 0xFF)
+#define FROM_16_TO_8(rgb) (cmsUInt8Number) ((((unsigned)(rgb) * 65281 + 8388608) >> 24) & 0xFF)
// Code analysis is broken on asserts
#ifdef _MSC_VER
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