diff --git a/lib/luks2/hw_opal/hw_opal.c b/lib/luks2/hw_opal/hw_opal.c
index ed527b3c..a0bca3ff 100644
--- a/lib/luks2/hw_opal/hw_opal.c
+++ b/lib/luks2/hw_opal/hw_opal.c
@@ -242,6 +242,8 @@ static int opal_ioctl(struct crypt_device *cd, int fd, unsigned long rq, void *a
 
 	opal_ioctl_debug(cd, rq, args, false, 0);
 	r = ioctl(fd, rq, args);
+	if (r < 0)
+		r = -errno;
 	opal_ioctl_debug(cd, rq, args, true, r);
 
 	return r;