diff --git a/mainwindow.cpp b/mainwindow.cpp
index 64c374711..5a89652fc 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -387,6 +387,10 @@ void MainWindow::show_debug_log() {
 void MainWindow::delete_slot() {
 	if (panel_timeline->headers->hasFocus()) {
 		panel_timeline->headers->delete_markers();
+    } else if (panel_footage_viewer->headers->hasFocus()) {
+        panel_footage_viewer->headers->delete_markers();
+    } else if (panel_sequence_viewer->headers->hasFocus()) {
+        panel_sequence_viewer->headers->delete_markers();
 	} else if (panel_timeline->focused()) {
 		panel_timeline->delete_selection(sequence->selections, false);
 	} else if (panel_effect_controls->is_focused()) {
diff --git a/panels/viewer.h b/panels/viewer.h
index 41bcdd1b4..ed2953343 100644
--- a/panels/viewer.h
+++ b/panels/viewer.h
@@ -76,6 +76,8 @@ public:
     Sequence* seq;
     QVector<Marker>* marker_ref;
 
+    TimelineHeader* headers;
+
 	void resizeEvent(QResizeEvent *event);
 
 public slots:
@@ -120,7 +122,6 @@ private:
 
 	void setup_ui();
 
-	TimelineHeader* headers;
 	ResizableScrollBar* horizontal_bar;
 	ViewerContainer* viewer_container;
 	LabelSlider* current_timecode_slider;
diff --git a/project/undo.cpp b/project/undo.cpp
index f8f90ff49..0ba5366c5 100644
--- a/project/undo.cpp
+++ b/project/undo.cpp
@@ -870,15 +870,15 @@ void MoveMarkerAction::redo() {
 	mainWindow->setWindowModified(true);
 }
 
-DeleteMarkerAction::DeleteMarkerAction(Sequence* s) :
-	seq(s),
+DeleteMarkerAction::DeleteMarkerAction(QVector<Marker> *m) :
+    active_array(m),
 	sorted(false),
 	old_project_changed(mainWindow->isWindowModified())
 {}
 
 void DeleteMarkerAction::undo() {
 	for (int i=markers.size()-1;i>=0;i--) {
-		seq->markers.insert(markers.at(i), copies.at(i));
+        active_array->insert(markers.at(i), copies.at(i));
 	}
 	mainWindow->setWindowModified(old_project_changed);
 }
@@ -887,14 +887,14 @@ void DeleteMarkerAction::redo() {
 	for (int i=0;i<markers.size();i++) {
 		// correct future removals
 		if (!sorted) {
-			copies.append(seq->markers.at(markers.at(i)));
+            copies.append(active_array->at(markers.at(i)));
 			for (int j=i+1;j<markers.size();j++) {
 				if (markers.at(j) > markers.at(i)) {
 					markers[j]--;
 				}
 			}
 		}
-		seq->markers.removeAt(markers.at(i));
+        active_array->removeAt(markers.at(i));
 	}
 	sorted = true;
 	mainWindow->setWindowModified(true);
diff --git a/project/undo.h b/project/undo.h
index e92f8b600..6a30be099 100644
--- a/project/undo.h
+++ b/project/undo.h
@@ -411,12 +411,12 @@ private:
 
 class DeleteMarkerAction : public QUndoCommand {
 public:
-	DeleteMarkerAction(Sequence* s);
+    DeleteMarkerAction(QVector<Marker>* m);
 	void undo();
 	void redo();
 	QVector<int> markers;
 private:
-	Sequence* seq;
+    QVector<Marker>* active_array;
 	QVector<Marker> copies;
 	bool sorted;
 	bool old_project_changed;
diff --git a/ui/timelineheader.cpp b/ui/timelineheader.cpp
index 02e9c0b8a..c6bdaa1fc 100644
--- a/ui/timelineheader.cpp
+++ b/ui/timelineheader.cpp
@@ -305,7 +305,7 @@ double TimelineHeader::get_zoom() {
 
 void TimelineHeader::delete_markers() {
 	if (selected_markers.size() > 0) {
-		DeleteMarkerAction* dma = new DeleteMarkerAction(viewer->seq);
+        DeleteMarkerAction* dma = new DeleteMarkerAction(viewer->marker_ref);
 		for (int i=0;i<selected_markers.size();i++) {
 			dma->markers.append(selected_markers.at(i));
 		}