diff --git a/src/industry_gui.cpp b/src/industry_gui.cpp
--- a/src/industry_gui.cpp
+++ b/src/industry_gui.cpp
@@ -128,7 +128,7 @@ static const WindowDesc _build_industry_
 	WDP_AUTO, WDP_AUTO, 170, 212, 170, 212,
 	WC_BUILD_INDUSTRY, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_RESIZABLE | WDF_CONSTRUCTION,
-	NULL, _nested_build_industry_widgets, lengthof(_nested_build_industry_widgets)
+	_nested_build_industry_widgets, lengthof(_nested_build_industry_widgets)
 );
 
 /** Build (fund or prospect) a new industry, */
@@ -823,7 +823,7 @@ static const WindowDesc _industry_view_d
 	WDP_AUTO, WDP_AUTO, 260, 120, 260, 120,
 	WC_INDUSTRY_VIEW, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_UNCLICK_BUTTONS | WDF_STICKY_BUTTON | WDF_RESIZABLE,
-	NULL, _nested_industry_view_widgets, lengthof(_nested_industry_view_widgets)
+	_nested_industry_view_widgets, lengthof(_nested_industry_view_widgets)
 );
 
 void ShowIndustryViewWindow(int industry)
@@ -1200,7 +1200,7 @@ static const WindowDesc _industry_direct
 	WDP_AUTO, WDP_AUTO, 428, 190, 428, 190,
 	WC_INDUSTRY_DIRECTORY, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_UNCLICK_BUTTONS | WDF_STICKY_BUTTON | WDF_RESIZABLE,
-	NULL, _nested_industry_directory_widgets, lengthof(_nested_industry_directory_widgets)
+	_nested_industry_directory_widgets, lengthof(_nested_industry_directory_widgets)
 );
 
 void ShowIndustryDirectory()