diff --git a/src/terraform_gui.cpp b/src/terraform_gui.cpp
--- a/src/terraform_gui.cpp
+++ b/src/terraform_gui.cpp
@@ -273,7 +273,7 @@ static const Widget _terraform_widgets[]
 };
 
 static const WindowDesc _terraform_desc = {
-	WDP_ALIGN_TBR, 22+36, 158, 36,
+	WDP_ALIGN_TBR, 22 + 36, 158, 36,
 	WC_SCEN_LAND_GEN, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_STICKY_BUTTON,
 	_terraform_widgets,