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-rw-r--r--include/ruby/ruby.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index e6ea830e64..da4c48f447 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -193,7 +193,7 @@ VALUE rb_ull2inum(unsigned LONG_LONG);
#define FIX2LONG(x) RSHIFT((SIGNED_VALUE)x,1)
#define FIX2ULONG(x) ((((VALUE)(x))>>1)&LONG_MAX)
#define FIXNUM_P(f) (((SIGNED_VALUE)(f))&FIXNUM_FLAG)
-#define POSFIXABLE(f) ((f) <= FIXNUM_MAX)
+#define POSFIXABLE(f) ((f) < FIXNUM_MAX+1)
#define NEGFIXABLE(f) ((f) >= FIXNUM_MIN)
#define FIXABLE(f) (POSFIXABLE(f) && NEGFIXABLE(f))