diff --git a/modules/paint/actions/rainbow_action.cpp b/modules/paint/actions/rainbow_action.cpp
index 08337e73f..40a69d552 100644
--- a/modules/paint/actions/rainbow_action.cpp
+++ b/modules/paint/actions/rainbow_action.cpp
@@ -71,12 +71,6 @@ void RainbowAction::do_action(PaintCanvas *canvas, const Array &data) {
 	}
 }
 
-void RainbowAction::commit_action(PaintCanvas *canvas) {
-	for (int idx = 0; idx < undo_cells.size(); ++idx) {
-		canvas->_set_pixel_v(layer, undo_cells[idx], undo_colors[idx]);
-	}
-}
-
 RainbowAction::RainbowAction() {
 }
 
diff --git a/modules/paint/actions/rainbow_action.h b/modules/paint/actions/rainbow_action.h
index 977bf07ef..f3a4259b0 100644
--- a/modules/paint/actions/rainbow_action.h
+++ b/modules/paint/actions/rainbow_action.h
@@ -34,7 +34,6 @@ class RainbowAction : public PaintAction {
 
 public:
 	void do_action(PaintCanvas *canvas, const Array &data);
-	void commit_action(PaintCanvas *canvas);
 
 	RainbowAction();
 	~RainbowAction();