diff --git a/main.go b/main.go
index b02608e..d655c70 100644
--- a/main.go
+++ b/main.go
@@ -66,7 +66,7 @@ func init() {
 	romCache.Cached = make(map[string]bool)
 
 	for _, rom := range romCache.ROMs {
-		romCache.Cached[rom.ID] = true
+		romCache.Cached[rom.Filename] = true
 		log.Printf("loaded cached file: %s", rom.Filename)
 	}