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-rw-r--r--io.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/io.c b/io.c
index 7381fe1..fe3b0ed 100644
--- a/io.c
+++ b/io.c
@@ -2889,7 +2889,7 @@ next_argv()
int defout_binmode = 0;
GetOpenFile(rb_defout, fptr);
- if (fptr->mode | FMODE_BINMODE)
+ if (fptr->mode & FMODE_BINMODE)
defout_binmode = 1;
if (init_p == 0) {