diff --git a/io/sys/darwin/posix.c b/io/sys/darwin/posix.c
index 77ae01c..2063072 100644
--- a/io/sys/darwin/posix.c
+++ b/io/sys/darwin/posix.c
@@ -22,6 +22,8 @@ enum b_status b_status_from_errno(int error, enum b_status default_value)
 		return B_ERR_IS_DIRECTORY;
 	case ENOTDIR:
 		return B_ERR_NOT_DIRECTORY;
+	case EPERM:
+		return B_ERR_PERMISSION_DENIED;
 	case ENOTSUP:
 	case ENOSYS:
 		return B_ERR_NOT_SUPPORTED;