diff --git a/internal/theme/default/icon.go b/internal/theme/default/icon.go
index b272a33..d8bf213 100644
--- a/internal/theme/default/icon.go
+++ b/internal/theme/default/icon.go
@@ -436,7 +436,7 @@ func (this *iconTheme) Icon (icon tomo.Icon, size tomo.IconSize) canvas.Texture
 	if texture, ok := source[icon]; ok {
 		return texture
 	}
-	return source[tomo.IconUnknown]
+	return nil
 }
 
 func (this *iconTheme) MimeIcon (mime data.Mime, size tomo.IconSize) canvas.Texture {