diff --git a/main.go b/main.go
index fb41f9d..e63f937 100644
--- a/main.go
+++ b/main.go
@@ -42,7 +42,7 @@ var (
 
 // Preload cached list of files and hashes
 func init() {
-	romCache := ROMCache{}
+	romCache = ROMCache{}
 	romCache.Cached = make(map[string]bool)
 	go updateROMCache("public")
 }
@@ -81,7 +81,7 @@ func updateROMCache(romDirectory string) {
 
 		// skip already cached files
 		romCache.Lock()
-		if romCache.Cached[d.Name()] {
+		if _, ok := romCache.Cached[d.Name()]; ok {
 			romCache.Unlock()
 			return nil
 		}