diff --git a/src/Thumbnail.vala b/src/Thumbnail.vala
index 5ea30d7..aad0a9f 100644
--- a/src/Thumbnail.vala
+++ b/src/Thumbnail.vala
@@ -95,7 +95,10 @@ public class Thumbnail : CheckerboardItem {
     }
     
     public static int64 exposure_time_ascending_comparator(void *a, void *b) {
-        return ((Thumbnail *) a)->photo.get_exposure_time() - ((Thumbnail *) b)->photo.get_exposure_time();
+        int64 res = (((Thumbnail *) a)->photo.get_exposure_time() - ((Thumbnail *) b)->photo.get_exposure_time());
+        if (res == 0)
+            res = title_ascending_comparator(a, b);
+        return res;
     }
     
     public static int64 exposure_time_desending_comparator(void *a, void *b) {