2 files changed, 3 insertions, 0 deletions
diff --git a/internal/string.h b/internal/string.h
index 50561924f2..d6fea62061 100644
--- a/internal/string.h
+++ b/internal/string.h
@@ -30,6 +30,7 @@ enum ruby_rstring_private_flags {
 #endif
 
 /* string.c */
+VALUE rb_str_dup_m(VALUE str);
 VALUE rb_fstring(VALUE);
 VALUE rb_fstring_cstr(const char *str);
 VALUE rb_fstring_enc_new(const char *ptr, long len, rb_encoding *enc);
diff --git a/internal/thread.h b/internal/thread.h
index 00fcbfc560..928126c3b0 100644
--- a/internal/thread.h
+++ b/internal/thread.h
@@ -83,6 +83,8 @@ RUBY_SYMBOL_EXPORT_END
 int rb_threadptr_execute_interrupts(struct rb_thread_struct *th, int blocking_timing);
 bool rb_thread_mn_schedulable(VALUE thread);
 
+bool rb_thread_resolve_unblock_function(rb_unblock_function_t **unblock_function, void **data2, struct rb_thread_struct *thread);
+
 // interrupt exec
 
 typedef VALUE (rb_interrupt_exec_func_t)(void *data);