diff --git a/aegisub/src/subs_edit_box.cpp b/aegisub/src/subs_edit_box.cpp
index b0cede815..aff468e0d 100644
--- a/aegisub/src/subs_edit_box.cpp
+++ b/aegisub/src/subs_edit_box.cpp
@@ -183,7 +183,7 @@ SubsEditBox::SubsEditBox(wxWindow *parent, agi::Context *context)
 	Bind(wxEVT_COMMAND_CHECKBOX_CLICKED, &SubsEditBox::OnCommentChange, this, CommentBox->GetId());
 
 	Bind(wxEVT_SIZE, &SubsEditBox::OnSize, this);
-	Bind(wxEVT_TIMER, &SubsEditBox::OnUndoTimer, this);
+	Bind(wxEVT_TIMER, [=](wxTimerEvent&) { commitId = -1; });
 
 	wxSizeEvent evt;
 	OnSize(evt);
@@ -378,10 +378,6 @@ void SubsEditBox::OnChange(wxStyledTextEvent &event) {
 	}
 }
 
-void SubsEditBox::OnUndoTimer(wxTimerEvent&) {
-	commitId = -1;
-}
-
 template<class setter>
 void SubsEditBox::SetSelectedRows(setter set, wxString const& desc, int type, bool amend) {
 	for_each(sel.begin(), sel.end(), set);
diff --git a/aegisub/src/subs_edit_box.h b/aegisub/src/subs_edit_box.h
index 67c5af65d..869aa7316 100644
--- a/aegisub/src/subs_edit_box.h
+++ b/aegisub/src/subs_edit_box.h
@@ -155,7 +155,6 @@ class SubsEditBox : public wxPanel {
 	void OnCommentChange(wxCommandEvent &);
 	void OnEffectChange(wxCommandEvent &);
 	void OnSize(wxSizeEvent &event);
-	void OnUndoTimer(wxTimerEvent&);
 
 	void SetPlaceholderCtrl(wxControl *ctrl, wxString const& value);