diff --git a/simgear/structure/event_mgr.hxx b/simgear/structure/event_mgr.hxx
index b68517ae..23ee5348 100644
--- a/simgear/structure/event_mgr.hxx
+++ b/simgear/structure/event_mgr.hxx
@@ -116,7 +116,7 @@ public:
 
     void removeTask(const std::string& name);
 private:
-    friend struct SGTimer;
+    friend class SGTimer;
 
     void add(const std::string& name, SGCallback* cb,
              double interval, double delay,