diff --git a/src/graph_gui.cpp b/src/graph_gui.cpp
index a056186edb..0bae50c411 100644
--- a/src/graph_gui.cpp
+++ b/src/graph_gui.cpp
@@ -1645,7 +1645,7 @@ struct IndustryProductionGraphWindow : BaseGraphWindow {
 
 	std::string GetWidgetString(WidgetID widget, StringID stringid) const override
 	{
-		if (widget == WID_GRAPH_CAPTION) GetString(STR_GRAPH_INDUSTRY_PRODUCTION_CAPTION, this->window_number);
+		if (widget == WID_GRAPH_CAPTION) return GetString(STR_GRAPH_INDUSTRY_PRODUCTION_CAPTION, this->window_number);
 
 		return this->Window::GetWidgetString(widget, stringid);
 	}