diff --git a/internal/glance/config-fields.go b/internal/glance/config-fields.go
index d368140..1527c72 100644
--- a/internal/glance/config-fields.go
+++ b/internal/glance/config-fields.go
@@ -141,13 +141,13 @@ func newCustomIconField(value string) customIconField {
 	const autoInvertPrefix = "auto-invert "
 	field := customIconField{}
 
+	if strings.HasPrefix(value, autoInvertPrefix) {
+		field.IsFlatIcon = true
+		value = strings.TrimPrefix(value, autoInvertPrefix)
+	}
+
 	prefix, icon, found := strings.Cut(value, ":")
 	if !found {
-		if strings.HasPrefix(value, autoInvertPrefix) {
-			field.IsFlatIcon = true
-			value = strings.TrimPrefix(value, autoInvertPrefix)
-		}
-
 		field.URL = template.URL(value)
 		return field
 	}