diff --git a/src/util/in-memory-storage-fifo.hpp b/src/util/in-memory-storage-fifo.hpp
index 3710284..2bc1880 100644
--- a/src/util/in-memory-storage-fifo.hpp
+++ b/src/util/in-memory-storage-fifo.hpp
@@ -47,18 +47,18 @@
   /** @brief Removes one Data packet from in-memory storage based on FIFO
    *  @return{ whether the Data was removed }
    */
-  virtual bool
+  bool
   evictItem() override;
 
   /** @brief Update the entry after a entry is successfully inserted, add it to the cleanupIndex
    */
-  virtual void
+  void
   afterInsert(InMemoryStorageEntry* entry) override;
 
   /** @brief Update the entry or other data structures before a entry is successfully erased,
    *  erase it from the cleanupIndex
    */
-  virtual void
+  void
   beforeErase(InMemoryStorageEntry* entry) override;
 
 private: