1 files changed, 1 insertions, 1 deletions
diff --git a/src/gui.h b/src/gui.h
index 963198e4e..d34994106 100644
--- a/src/gui.h
+++ b/src/gui.h
@@ -58,7 +58,7 @@ void ShowIndustryDirectory();
 void ShowSubsidiesList();
 
 void ShowEstimatedCostOrIncome(Money cost, int x, int y);
-void ShowErrorMessage(StringID msg_1, StringID msg_2, int x, int y);
+void ShowErrorMessage(StringID msg_1, StringID msg_2, int x, int y, bool no_timeout = false);
 
 void ShowSmallMap();
 void ShowExtraViewPortWindow(TileIndex tile = INVALID_TILE);