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-rw-r--r--include/ruby/internal/intern/select/posix.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/internal/intern/select/posix.h b/include/ruby/internal/intern/select/posix.h
index 6c1092b39d..0bf68ae204 100644
--- a/include/ruby/internal/intern/select/posix.h
+++ b/include/ruby/internal/intern/select/posix.h
@@ -55,7 +55,7 @@ rb_fd_copy(rb_fdset_t *dst, const fd_set *src, int n)
}
static inline void
-rb_fd_dup(rb_fdset_t *dst, const fd_set *src, int n)
+rb_fd_dup(rb_fdset_t *dst, const fd_set *src)
{
*dst = *src;
}