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-rw-r--r--ext/stringio/stringio.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index 3e9821527c..8ae4cd5b2e 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -20,6 +20,10 @@
#include <sys/fcntl.h>
#endif
+#ifndef RB_INTEGER_TYPE_P
+# define RB_INTEGER_TYPE_P(c) (FIXNUM_P(c) || RB_TYPE_P(c, T_BIGNUM))
+#endif
+
struct StringIO {
VALUE string;
rb_encoding *enc;