diff --git a/callback_table.c b/callback_table.c
index 5c0fdbb1e3..4dde04b50b 100644
--- a/callback_table.c
+++ b/callback_table.c
@@ -71,4 +71,4 @@ CommandCallback *_callback_table[] = {
 	/* 0x14 */ CcTerraform
 };
 
-const int _callback_table_count = sizeof (_callback_table) / sizeof (*_callback_table);
+const int _callback_table_count = lengthof(_callback_table);