1 files changed, 1 insertions, 0 deletions
diff --git a/intern.h b/intern.h
index e0c365fdca..1c16c548d5 100644
--- a/intern.h
+++ b/intern.h
@@ -149,6 +149,7 @@ void rb_thread_wait_fd _((int));
 int rb_thread_fd_writable _((int));
 void rb_thread_fd_close _((int));
 int rb_thread_alone _((void));
+void rb_thread_polling _((void));
 void rb_thread_sleep _((int));
 void rb_thread_sleep_forever _((void));
 VALUE rb_thread_stop _((void));