1 files changed, 1 insertions, 1 deletions
diff --git a/Graphics.c b/Graphics.c
index 39fea11..e8e7897 100644
--- a/Graphics.c
+++ b/Graphics.c
@@ -69,7 +69,7 @@ from The Open Group.
 
 #define GetBit(image, x, y)\
     ((bit)((*(image->data + (x) / 8 + (y) * image->bytes_per_line) &\
-	    (1 << ((x) % 8))) ? 1 : 0))
+	    (1 << ((x) & 7))) ? 1 : 0))
 
 #if 0
 bit