diff --git a/config/config.go b/config/config.go
index db31265..ecc0087 100644
--- a/config/config.go
+++ b/config/config.go
@@ -59,7 +59,7 @@ var (
 	ProxyMode   bool
 	Prefetch    bool
 	Config      jsonFile
-	Version     = "0.9.2"
+	Version     = "0.9.3"
 	WriteLock   = cache.New(5*time.Minute, 10*time.Minute)
 )
 
diff --git a/helper/helper.go b/helper/helper.go
index c956337..607d85a 100644
--- a/helper/helper.go
+++ b/helper/helper.go
@@ -17,6 +17,8 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
+var _ = filetype.AddMatcher(filetype.NewType("avif", "image/avif"), avifMatcher)
+
 func avifMatcher(buf []byte) bool {
 	// use hexdump on macOS to see the magic number
 	// 0000001c 66747970 61766966 00000000 61766966 6d696631 6d696166
@@ -34,7 +36,6 @@ func avifMatcher(buf []byte) bool {
 }
 
 func GetFileContentType(buffer []byte) string {
-	filetype.AddMatcher(filetype.NewType("avif", "image/avif"), avifMatcher)
 	kind, _ := filetype.Match(buffer)
 	return kind.MIME.Value
 }