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-rw-r--r--mrbgems/mruby-io/include/mruby/ext/io.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-io/include/mruby/ext/io.h b/mrbgems/mruby-io/include/mruby/ext/io.h
index ba088156e..5d1dde354 100644
--- a/mrbgems/mruby-io/include/mruby/ext/io.h
+++ b/mrbgems/mruby-io/include/mruby/ext/io.h
@@ -30,7 +30,7 @@ struct mrb_io {
#define E_IO_ERROR (mrb_class_get(mrb, "IOError"))
#define E_EOF_ERROR (mrb_class_get(mrb, "EOFError"))
-mrb_value mrb_io_fileno(mrb_state *mrb, mrb_value io);
+int mrb_io_fileno(mrb_state *mrb, mrb_value io);
#if defined(__cplusplus)
} /* extern "C" { */