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-rw-r--r--include/ruby/io.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/io.h b/include/ruby/io.h
index a15795252b..60d6f6d32e 100644
--- a/include/ruby/io.h
+++ b/include/ruby/io.h
@@ -130,7 +130,7 @@ FILE *rb_io_stdio_file(rb_io_t *fptr);
FILE *rb_fdopen(int, const char*);
int rb_io_modestr_fmode(const char *modestr);
int rb_io_modestr_oflags(const char *modestr);
-int rb_io_oflags_fmode(int oflags);
+CONSTFUNC(int rb_io_oflags_fmode(int oflags));
void rb_io_check_writable(rb_io_t*);
void rb_io_check_readable(rb_io_t*);
void rb_io_check_char_readable(rb_io_t *fptr);