diff --git a/editor/plugins/animation_player_editor_plugin.h b/editor/plugins/animation_player_editor_plugin.h
index f53491fa2..a393f7a84 100644
--- a/editor/plugins/animation_player_editor_plugin.h
+++ b/editor/plugins/animation_player_editor_plugin.h
@@ -45,6 +45,7 @@ class AnimationTrackEditor;
 class AnimationPlayerEditorPlugin;
 class AcceptDialog;
 class AnimationPlayer;
+class Animation;
 class Button;
 class ConfirmationDialog;
 class Control;