diff --git a/vlib/compiler/gen_c.v b/vlib/compiler/gen_c.v
index dc49332f76..db1a5ebef9 100644
--- a/vlib/compiler/gen_c.v
+++ b/vlib/compiler/gen_c.v
@@ -628,6 +628,9 @@ fn type_default(typ string) string {
 	if typ.contains('__') {
 		return '{0}'
 	}
+	if typ.ends_with('Fn') { // TODO
+		return '0'
+	}
 	// Default values for other types are not needed because of mandatory initialization
 	match typ {
 		'bool' {
diff --git a/vlib/compiler/table.v b/vlib/compiler/table.v
index ed71a3658f..1224a7039b 100644
--- a/vlib/compiler/table.v
+++ b/vlib/compiler/table.v
@@ -621,6 +621,10 @@ fn (p mut Parser) check_types2(got_, expected_ string, throw bool) bool {
 	if got.starts_with('varg_') {
 		got = got[5..]
 	}
+	// fn == 0 temporary
+	if got == 'int' && expected.ends_with('Fn') {
+		return true
+	}
 	// Allow ints to be used as floats
 	if got == 'int' && expected == 'f32' {
 		return true