diff --git a/thumbnail/Thumbnailer.go b/thumbnail/Thumbnailer.go
index 6ea2e98..36064d0 100644
--- a/thumbnail/Thumbnailer.go
+++ b/thumbnail/Thumbnailer.go
@@ -5,6 +5,7 @@ import (
 	"image/gif"
 	"image/jpeg"
 	"image/png"
+	"mime"
 	"os"
 	"path/filepath"
 	"strings"