diff --git a/src/proto/terminal.pro b/src/proto/terminal.pro
index f5bd1a6..d814bc8 100644
--- a/src/proto/terminal.pro
+++ b/src/proto/terminal.pro
@@ -18,6 +18,7 @@
 cursorentry_T *term_get_cursor_shape(guicolor_T *fg, guicolor_T *bg);
 int term_use_loop(void);
 void term_win_entered(void);
+void term_focus_change(int in_focus);
 int terminal_loop(int blocking);
 int may_close_term_popup(void);
 void term_channel_closing(channel_T *ch);