1 files changed, 1 insertions, 0 deletions

diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 5316e8a4a4fd..c73dfa78f943 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -329,6 +329,7 @@ extern void os_set_ioignore(void);
 extern void init_irq_signals(int on_sigstack);
 
 /* sigio.c */
+extern int add_sigio_fd(int fd);
 extern int ignore_sigio_fd(int fd);
 extern void maybe_sigio_broken(int fd, int read);