diff --git a/spine-godot/spine_godot/SpineTimeline.cpp b/spine-godot/spine_godot/SpineTimeline.cpp
index 2c05df6f9..a4b13c908 100644
--- a/spine-godot/spine_godot/SpineTimeline.cpp
+++ b/spine-godot/spine_godot/SpineTimeline.cpp
@@ -43,7 +43,7 @@ void SpineTimeline::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_type"), &SpineTimeline::get_type);
 }
 
-SpineTimeline::SpineTimeline() : timeline(NULL) {
+SpineTimeline::SpineTimeline() : timeline(nullptr) {
 }
 
 void SpineTimeline::apply(Ref<SpineSkeleton> skeleton, float last_time, float time, Array events, float alpha,