diff --git a/image/imgLoader.h b/image/imgLoader.h
index 84272c4832..7349a666e5 100644
--- a/image/imgLoader.h
+++ b/image/imgLoader.h
@@ -128,6 +128,7 @@ public:
 private: // methods
   friend class imgLoader;
   friend class imgCacheQueue;
+  friend class imgCacheExpirationTracker;
   void Touch(bool updateTime = true);
   void UpdateCache(int32_t diff = 0);
   void SetEvicted(bool evict)