diff --git a/spine-godot/spine_godot/SpineSlotNode.h b/spine-godot/spine_godot/SpineSlotNode.h
index 4d0113f85..8d33a7ccf 100644
--- a/spine-godot/spine_godot/SpineSlotNode.h
+++ b/spine-godot/spine_godot/SpineSlotNode.h
@@ -35,6 +35,7 @@
 #include <godot_cpp/classes/node2d.hpp>
 #else
 #include "scene/2d/node_2d.h"
+#include "scene/resources/material.h"
 #endif
 
 class SpineSlotNode : public Node2D {