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-rw-r--r--internal/bignum.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/internal/bignum.h b/internal/bignum.h
index c7b9b324d7..95c1e6eacd 100644
--- a/internal/bignum.h
+++ b/internal/bignum.h
@@ -74,7 +74,7 @@
# define PRIXBDIGIT_DBL PRI_BDIGIT_DBL_PREFIX"X"
#endif
-#define RBIGNUM(obj) (R_CAST(RBignum)(obj))
+#define RBIGNUM(obj) ((struct RBignum *)(obj))
#define BIGNUM_SIGN_BIT FL_USER1
#define BIGNUM_EMBED_FLAG ((VALUE)FL_USER2)
#define BIGNUM_EMBED_LEN_NUMBITS 3