diff --git a/theme.go b/theme.go
index 1039b88..8e5ebd0 100644
--- a/theme.go
+++ b/theme.go
@@ -105,7 +105,7 @@ const (
 type Icon int
 
 // IconNone specifies no icon.
-const IconNone = -1
+const IconNone Icon = -1
 
 const (
 	// Place icons