diff --git a/vlib/builtin/option.v b/vlib/builtin/option.v
index 6f97ee977b..02e8235a8a 100644
--- a/vlib/builtin/option.v
+++ b/vlib/builtin/option.v
@@ -113,14 +113,6 @@ struct Option {
 	// derived Option_xxx types
 }
 
-fn opt_ok(data voidptr, mut option Option, size int) {
-	unsafe {
-		*option = Option{}
-		// use err to get the end of OptionBase and then memcpy into it
-		vmemcpy(&u8(&option.err) + sizeof(IError), data, size)
-	}
-}
-
 // option is the base of V's internal optional return system.
 struct _option {
 	state u8
@@ -130,6 +122,14 @@ struct _option {
 	// derived _option_xxx types
 }
 
+fn _option_ok(data voidptr, mut option _option, size int) {
+	unsafe {
+		*option = _option{}
+		// use err to get the end of OptionBase and then memcpy into it
+		vmemcpy(&u8(&option.err) + sizeof(IError), data, size)
+	}
+}
+
 fn opt_ok2(data voidptr, mut option _option, size int) {
 	unsafe {
 		*option = _option{}
diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index ab50eadbf3..ab9e2604d3 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -5237,7 +5237,7 @@ fn (mut g Gen) or_block(var_name string, or_block ast.OrExpr, return_type ast.Ty
 				styp := g.typ(g.fn_decl.return_type)
 				err_obj := g.new_tmp_var()
 				g.writeln('\t$styp $err_obj;')
-				g.writeln('\tmemcpy(&$err_obj, &$cvar_name, sizeof(Option));')
+				g.writeln('\tmemcpy(&$err_obj, &$cvar_name, sizeof(_option));')
 				g.writeln('\treturn $err_obj;')
 			}
 		}
diff --git a/vlib/v/markused/markused.v b/vlib/v/markused/markused.v
index a7688aabbe..2329590854 100644
--- a/vlib/v/markused/markused.v
+++ b/vlib/v/markused/markused.v
@@ -35,8 +35,9 @@ pub fn mark_used(mut table ast.Table, pref &pref.Preferences, ast_files []&ast.F
 		'tos2',
 		'tos3',
 		'isnil',
-		'opt_ok',
 		'opt_ok2',
+		'_option_ok',
+		'_result_ok',
 		'error',
 		// utf8_str_visible_length is used by c/str.v
 		'utf8_str_visible_length',