diff --git a/libs/pbd/pbd/undo.h b/libs/pbd/pbd/undo.h
index 851818f36d..872c865f08 100644
--- a/libs/pbd/pbd/undo.h
+++ b/libs/pbd/pbd/undo.h
@@ -79,8 +79,6 @@ private:
 	struct timeval      _timestamp;
 	bool                _clearing;
 
-	friend void command_death (UndoTransaction*, Command*);
-
 	void about_to_explicitly_delete ();
 };
 
diff --git a/libs/pbd/undo.cc b/libs/pbd/undo.cc
index 4a4ca81a3a..0c1528aedb 100644
--- a/libs/pbd/undo.cc
+++ b/libs/pbd/undo.cc
@@ -52,7 +52,7 @@ UndoTransaction::~UndoTransaction ()
 	clear ();
 }
 
-void
+static void
 command_death (UndoTransaction* ut, Command* c)
 {
 	if (ut->clearing ()) {