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-rw-r--r--include/ruby/intern.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/intern.h b/include/ruby/intern.h
index ada1ec0944..739ff1e834 100644
--- a/include/ruby/intern.h
+++ b/include/ruby/intern.h
@@ -676,7 +676,7 @@ VALUE rb_mutex_try_lock(VALUE mutex);
VALUE rb_mutex_lock(VALUE mutex);
VALUE rb_mutex_unlock(VALUE mutex);
VALUE rb_mutex_sleep(VALUE self, VALUE timeout);
-VALUE rb_mutex_synchronize(VALUE self);
+VALUE rb_mutex_synchronize(VALUE mutex, VALUE (*func)(VALUE arg), VALUE arg);
VALUE rb_barrier_new(void);
VALUE rb_barrier_wait(VALUE self);
VALUE rb_barrier_release(VALUE self);