1 files changed, 1 insertions, 2 deletions
diff --git a/configure.in b/configure.in
index 2c7a14bd7e..9d5c4ccb5c 100644
--- a/configure.in
+++ b/configure.in
@@ -234,11 +234,10 @@ AC_CHAR_UNSIGNED
 AC_MSG_CHECKING(whether right shift preserve sign bit)
 AC_CACHE_VAL(rb_cv_rshift_sign,
     [AC_TRY_RUN([
-#define FIXNUM_FLAG 0x01
 int
 main()
 {
-  if (-1==(((-1)<<1)|FIXNUM_FLAG)>>1);
+  if (-1==((-1)>>1))
     return 0;
   return 1;
 }