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-rw-r--r--internal.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 2b8176c28b..f21c1c40b5 100644
--- a/internal.h
+++ b/internal.h
@@ -252,10 +252,13 @@ struct rb_subclass_entry {
#if defined(HAVE_LONG_LONG)
typedef unsigned LONG_LONG rb_serial_t;
+#define SERIALT2NUM ULL2NUM
#elif defined(HAVE_UINT64_T)
typedef uint64_t rb_serial_t;
+#define SERIALT2NUM SIZET2NUM
#else
typedef unsigned long rb_serial_t;
+#define SERIALT2NUM ULONG2NUM
#endif
struct rb_classext_struct {