diff --git a/include/footprint_info.h b/include/footprint_info.h
index 93003b0c43..e4000efcb9 100644
--- a/include/footprint_info.h
+++ b/include/footprint_info.h
@@ -191,10 +191,7 @@ public:
     /**
      * @return Clears the footprint info cache
      */
-    void Clear()
-    {
-        m_list.clear();
-    }
+    virtual void Clear() = 0;
 
     /**
      * Get info for a footprint by id.
diff --git a/pcbnew/footprint_info_impl.cpp b/pcbnew/footprint_info_impl.cpp
index 8f7596a4e1..2d33a058f2 100644
--- a/pcbnew/footprint_info_impl.cpp
+++ b/pcbnew/footprint_info_impl.cpp
@@ -66,6 +66,13 @@ void FOOTPRINT_INFO_IMPL::load()
 }
 
 
+void FOOTPRINT_LIST_IMPL::Clear()
+{
+    m_list.clear();
+    m_list_timestamp = 0;
+}
+
+
 bool FOOTPRINT_LIST_IMPL::CatchErrors( const std::function<void()>& aFunc )
 {
     try
diff --git a/pcbnew/footprint_info_impl.h b/pcbnew/footprint_info_impl.h
index 5f5d7d6803..7dc4450840 100644
--- a/pcbnew/footprint_info_impl.h
+++ b/pcbnew/footprint_info_impl.h
@@ -93,6 +93,8 @@ public:
     bool ReadFootprintFiles( FP_LIB_TABLE* aTable, const wxString* aNickname = nullptr,
                              PROGRESS_REPORTER* aProgressReporter = nullptr ) override;
 
+    void Clear() override;
+
 protected:
     void loadLibs();
     void loadFootprints();