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-rw-r--r--mrbgems/mruby-rational/src/rational.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-rational/src/rational.c b/mrbgems/mruby-rational/src/rational.c
index 4093f1b13..173a416e8 100644
--- a/mrbgems/mruby-rational/src/rational.c
+++ b/mrbgems/mruby-rational/src/rational.c
@@ -188,7 +188,7 @@ rational_new_f(mrb_state *mrb, mrb_float f0)
else {
n = -n;
}
- return rational_new_i(mrb, f, 1L<<n);
+ return rational_new_i(mrb, f, ((mrb_int)1)<<n);
#else
mrb_int pow = 1;
if (n < 0) {