diff --git a/include/ruby/internal/intern/thread.h b/include/ruby/internal/intern/thread.h
index 4b3f08e571..a12a371058 100644
--- a/include/ruby/internal/intern/thread.h
+++ b/include/ruby/internal/intern/thread.h
@@ -71,11 +71,6 @@ VALUE rb_mutex_unlock(VALUE mutex);
 VALUE rb_mutex_sleep(VALUE self, VALUE timeout);
 VALUE rb_mutex_synchronize(VALUE mutex, VALUE (*func)(VALUE arg), VALUE arg);
 
-VALUE rb_thread_scheduler_get(VALUE);
-VALUE rb_thread_scheduler_set(VALUE, VALUE);
-
-VALUE rb_thread_scheduler_if_nonblocking(VALUE thread);
-
 RBIMPL_SYMBOL_EXPORT_END()
 
 #endif /* RBIMPL_INTERN_THREAD_H */
diff --git a/internal/thread.h b/internal/thread.h
index ac09923be0..91626b7e76 100644
--- a/internal/thread.h
+++ b/internal/thread.h
@@ -37,6 +37,10 @@ void rb_mutex_allow_trap(VALUE self, int val);
 VALUE rb_uninterruptible(VALUE (*b_proc)(VALUE), VALUE data);
 VALUE rb_mutex_owned_p(VALUE self);
 
+VALUE rb_thread_scheduler_get(VALUE);
+VALUE rb_thread_scheduler_set(VALUE, VALUE);
+VALUE rb_thread_scheduler_if_nonblocking(VALUE thread);
+
 RUBY_SYMBOL_EXPORT_BEGIN
 /* Temporary.  This API will be removed (renamed). */
 VALUE rb_thread_io_blocking_region(rb_blocking_function_t *func, void *data1, int fd);