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-rw-r--r--engines/sky/compact.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/engines/sky/compact.cpp b/engines/sky/compact.cpp
index 35701e43a1..1d3233eb41 100644
--- a/engines/sky/compact.cpp
+++ b/engines/sky/compact.cpp
@@ -29,12 +29,13 @@
#include "common/file.h"
#include "sky/compact.h"
#include "gui/message.h"
+#include <stddef.h> // for ptrdiff_t
namespace Sky {
#define SKY_CPT_SIZE 419427
-#define OFFS(type,item) (((long)(&((type*)0)->item)))
+#define OFFS(type,item) (((ptrdiff_t)(&((type*)42)->item))-42)
#define MK32(type,item) OFFS(type, item),0,0,0
#define MK16(type,item) OFFS(type, item),0
#define MK32_A5(type, item) MK32(type, item[0]), MK32(type, item[1]), \