2 files changed, 25 insertions, 7 deletions
diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index a1e094a7a4..535317c407 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -874,13 +874,11 @@ class LIBARDOUR_API Session : public PBD::StatefulDestructible, public PBD::Scop
 	/** Undo some transactions.
 	 * @param n Number of transactions to undo.
 	 */
-	void undo (uint32_t n) {
-		_history.undo (n);
-	}
-
-	void redo (uint32_t n) {
-		_history.redo (n);
-	}
+	void undo (uint32_t n);
+	/** Redo some transactions.
+	 * @param n Number of transactions to undo.
+	 */
+	void redo (uint32_t n);
 
 	UndoHistory& history() { return _history; }
 
diff --git a/libs/ardour/session_state.cc b/libs/ardour/session_state.cc
index 76cf2d3755..41d6d51979 100644
--- a/libs/ardour/session_state.cc
+++ b/libs/ardour/session_state.cc
@@ -4916,3 +4916,23 @@ Session::save_as (SaveAs& saveas)
 
 	return 0;
 }
+
+void
+Session::undo (uint32_t n)
+{
+	if (actively_recording()) {
+		return;
+	}
+
+	_history.undo (n);
+}
+
+void
+Session::redo (uint32_t n)
+{
+	if (actively_recording()) {
+		return;
+	}
+
+	_history.redo (n);
+}