diff --git a/vlib/v/gen/c/str.v b/vlib/v/gen/c/str.v
index f09a82edf3..eefdd5500c 100644
--- a/vlib/v/gen/c/str.v
+++ b/vlib/v/gen/c/str.v
@@ -85,7 +85,7 @@ fn (mut g Gen) gen_expr_to_string(expr ast.Expr, etype ast.Type) {
 	} else if typ == ast.bool_type {
 		g.expr(expr)
 		g.write(' ? _SLIT("true") : _SLIT("false")')
-	} else if sym.kind == .none_ {
+	} else if sym.kind == .none_ || typ == ast.void_type.set_flag(.option) {
 		g.write('_SLIT("<none>")')
 	} else if sym.kind == .enum_ {
 		if expr !is ast.EnumVal {
diff --git a/vlib/v/tests/option_void_fn_return_test.v b/vlib/v/tests/option_void_fn_return_test.v
new file mode 100644
index 0000000000..5c354ac5e3
--- /dev/null
+++ b/vlib/v/tests/option_void_fn_return_test.v
@@ -0,0 +1,8 @@
+fn foo() ? {
+	return none
+}
+
+fn test_main() {
+	println(foo()) // <none>
+	assert true
+}