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-rw-r--r--src/engine_gui.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/engine_gui.h b/src/engine_gui.h
index 4fe88ec2c..fc0b7ad7d 100644
--- a/src/engine_gui.h
+++ b/src/engine_gui.h
@@ -35,6 +35,7 @@ void DrawAircraftEngine(int left, int right, int preferred_x, int y, EngineID en
extern bool _engine_sort_direction;
extern byte _engine_sort_last_criteria[];
extern bool _engine_sort_last_order[];
+extern bool _engine_sort_show_hidden_engines[];
extern const StringID _engine_sort_listing[][12];
extern EngList_SortTypeFunction * const _engine_sort_functions[][11];