diff --git a/src/gui/options/options.tw b/src/gui/options/options.tw
index 67ba28728ffa2936204e306f5fc52f4b4dcd7729..9bfdff03ebaf0e1b309b8862fe117637e9dc7bc4 100644
--- a/src/gui/options/options.tw
+++ b/src/gui/options/options.tw
@@ -478,7 +478,7 @@
 			<div class="subHeading">
 			<<if $debugMode || $cheatMode || $cheatModeM>>
 				''Debug/cheat''
-				<<set popCap = menialPopCap()>>
+				<<set $popCap = menialPopCap()>>
 
 				<style>
 					table.invisible {