diff --git a/internal/system/enablement.go b/internal/system/enablement.go
index 7876f6b..f443562 100644
--- a/internal/system/enablement.go
+++ b/internal/system/enablement.go
@@ -24,6 +24,9 @@ var enablementString = [...]string{
 const ELen = len(enablementString)
 
 func (e Enablement) String() string {
+	if int(e) >= ELen {
+		return "<invalid enablement>"
+	}
 	return enablementString[e]
 }