diff --git a/media/media.go b/media/media.go
index 0674c3c..0051ff5 100644
--- a/media/media.go
+++ b/media/media.go
@@ -28,6 +28,15 @@ type MediaSource struct {
 	set Set
 }
 
+type Media struct {
+	Type     string
+	Name     string
+	Size     image.Rectangle
+	FullName string
+
+	metadata *metadata.Metadata
+}
+
 func (ms *MediaSource) LocationOrig(m Media) string {
 	return path.Join(ms.StorageDir, m.Name)
 }
@@ -70,15 +79,6 @@ func (ms *MediaSource) ReceiveNewMedia(name string, r io.Reader) error {
 	return f.Close()
 }
 
-type Media struct {
-	Type     string
-	Name     string
-	Size     image.Rectangle
-	FullName string
-
-	metadata *metadata.Metadata
-}
-
 func (m *Media) Date() time.Time {
 	m.getMetadata()
 
@@ -178,8 +178,11 @@ func (ms *MediaSource) ThumbMax(m Media, maxDim int) (string, image.Rectangle, e
 }
 
 func (ms *MediaSource) HasThumb(m Media, size image.Rectangle) bool {
-	_, err := os.Stat(ms.ThumbFilename(m, size))
-	return err == nil
+	fi, err := os.Stat(ms.ThumbFilename(m, size))
+	if err != nil {
+		return false
+	}
+	return m.Date().Before(fi.ModTime())
 }
 
 func (ms *MediaSource) ByName(name string) *Media {