1 files changed, 1 insertions, 0 deletions
diff --git a/core/qthelper.h b/core/qthelper.h
index 4c0dcda66..ac1de4df8 100644
--- a/core/qthelper.h
+++ b/core/qthelper.h
@@ -30,6 +30,7 @@ void write_hashes();
 void updateHash(struct picture *picture);
 QByteArray hashFile(const QString &filename);
 QString hashString(const char *filename);
+QString thumbnailFileName(const QString &filename);
 void learnImages(const QDir dir, int max_recursions);
 void add_hash(const QString &filename, const QByteArray &hash);
 void hashPicture(struct picture *picture);