diff --git a/src/icon.rs b/src/icon.rs
index d5801a3..c2bb062 100644
--- a/src/icon.rs
+++ b/src/icon.rs
@@ -5,6 +5,7 @@ use url::Url;
 
 use crate::Error;
 
+#[non_exhaustive]
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum IconKind {
     HardcodedURL,