diff --git a/src/proto/ops.pro b/src/proto/ops.pro
index aaffa02..27e0f11 100644
--- a/src/proto/ops.pro
+++ b/src/proto/ops.pro
@@ -43,7 +43,7 @@
 int fex_format __ARGS((linenr_T lnum, long count, int c));
 void format_lines __ARGS((linenr_T line_count, int avoid_fex));
 int paragraph_start __ARGS((linenr_T lnum));
-int do_addsub __ARGS((int command, linenr_T Prenum1, int g_cmd));
+void op_addsub __ARGS((oparg_T *oap, linenr_T Prenum1, int g_cmd));
 int read_viminfo_register __ARGS((vir_T *virp, int force));
 void write_viminfo_registers __ARGS((FILE *fp));
 void x11_export_final_selection __ARGS((void));