diff --git a/src/proto/os_unix.pro b/src/proto/os_unix.pro
index d9dc8d9..be4942d 100644
--- a/src/proto/os_unix.pro
+++ b/src/proto/os_unix.pro
@@ -91,4 +91,6 @@
 void stop_timeout(void);
 volatile sig_atomic_t *start_timeout(long msec);
 void delete_timer(void);
+void f_getcellpixels(typval_T *argvars UNUSED, typval_T *rettv);
+void mch_calc_cell_size(struct cellsize *cs_out);
 /* vim: set ft=c : */