diff --git a/src/rpn.rs b/src/rpn.rs
index 7383201..b2c1bcc 100644
--- a/src/rpn.rs
+++ b/src/rpn.rs
@@ -231,7 +231,7 @@ fn main() -> ExitCode {
 
 	#[cfg(target_os="openbsd")] {
 		let promises = Promises::new("stdio unveil");
-		if let Err(e) = pledge(Some(promises), None) {
+		if let Err(e) = pledge(Some(promises), Some(Promises::default())) {
 			return err(&argv[0], &e, Some(EX_OSERR));
 		}