...

diff --git a/coders/dds.c b/coders/dds.c
index d41706fd89bbad42fe10aa2609aea50cdd9f1312..6fd058acd1f7d9dd9179c52d428983e14bb68f66 100644 (file)
--- a/coders/dds.c
+++ b/coders/dds.c
@@ -725,9 +725,9 @@ static const DDSSingleColourLookup*
 #define FixRange(min, max, steps) \
 if (min > max) \
   min = max; \
-if (max - min < steps) \
+if ((ssize_t) max - min < steps) \
   max = MagickMin(min + steps, 255); \
-if (max - min < steps) \
+if ((ssize_t) max - min < steps) \
   min = MagickMax(0, max - steps)
 
 #define Dot(left, right) (left.x*right.x) + (left.y*right.y) + (left.z*right.z)