diff --git a/internal/thread.h b/internal/thread.h
index 568351e6cb..886818b023 100644
--- a/internal/thread.h
+++ b/internal/thread.h
@@ -9,6 +9,10 @@
  *             modify this file, provided that  the conditions mentioned in the
  *             file COPYING are met.  Consult the file for details.
  */
+#include "ruby/ruby.h"          /* for VALUE */
+#include "ruby/intern.h"        /* for rb_blocking_function_t */
+
+struct rb_thread_struct;        /* in vm_core.h */
 
 /* thread.c */
 #define COVERAGE_INDEX_LINES    0
@@ -41,4 +45,8 @@ VALUE rb_thread_io_blocking_region(rb_blocking_function_t *func, void *data1, in
 int ruby_thread_has_gvl_p(void); /* for ext/fiddle/closure.c */
 RUBY_SYMBOL_EXPORT_END
 
+MJIT_SYMBOL_EXPORT_BEGIN
+int rb_threadptr_execute_interrupts(struct rb_thread_struct *th, int blocking_timing);
+MJIT_SYMBOL_EXPORT_END
+
 #endif /* INTERNAL_THREAD_H */