1 files changed, 4 insertions, 2 deletions
diff --git a/io.c b/io.c
index 18faa42826..aed61fb670 100644
--- a/io.c
+++ b/io.c
@@ -2908,11 +2908,13 @@ rb_io_binmode(VALUE io)
 static VALUE
 rb_io_binmode_m(VALUE io)
 {
-    rb_io_binmode(io);
-
 #if defined(_WIN32) || defined(DJGPP) || defined(__CYGWIN__) || defined(__human68k__) || defined(__EMX__)
     VALUE write_io;
+#endif
 
+    rb_io_binmode(io);
+
+#if defined(_WIN32) || defined(DJGPP) || defined(__CYGWIN__) || defined(__human68k__) || defined(__EMX__)
     write_io = GetWriteIO(io);
     if (write_io != io)
         rb_io_binmode(write_io);