diff --git a/internal/glance/config-fields.go b/internal/glance/config-fields.go
index 2eec599..70a3e74 100644
--- a/internal/glance/config-fields.go
+++ b/internal/glance/config-fields.go
@@ -155,7 +155,7 @@ func newCustomIconField(value string) customIconField {
 		basename = icon
 	}
 
-	if ext != "svg" && ext != "png" {
+	if ext != "svg" && ext != "png" && ext != "webp" {
 		ext = "svg"
 	}