diff -urN a/internal/dcraw_common.cpp b/internal/dcraw_common.cpp
--- a/internal/dcraw_common.cpp	2016-05-30 11:35:23.779168782 -0600
+++ b/internal/dcraw_common.cpp	2016-05-30 11:35:37.268641475 -0600
@@ -2469,7 +2469,7 @@
 
 void CLASS kodak_radc_load_raw()
 {
-  static const char src[] = {
+  static const signed char src[] = {
     1,1, 2,3, 3,4, 4,2, 5,7, 6,5, 7,6, 7,8,
     1,0, 2,1, 3,3, 4,4, 5,2, 6,7, 7,6, 8,5, 8,8,
     2,1, 2,3, 3,0, 3,2, 3,4, 4,6, 5,5, 6,7, 6,8,