diff --git a/code/WorkInProgress/AI_Visibility/chunk.dm b/code/WorkInProgress/AI_Visibility/chunk.dm
index f0a10a07eea..2677dd67f34 100644
--- a/code/WorkInProgress/AI_Visibility/chunk.dm
+++ b/code/WorkInProgress/AI_Visibility/chunk.dm
@@ -193,7 +193,7 @@
 		if(!(t in visibleTurfs))
 			if(!t.dim)
 				t.dim = image('cameravis.dmi', t, "dim", 15)
-				t.mouse_opacity = 0
+				t.dim.mouse_opacity = 0
 
 			dim += t.dim
 			images_added += t.dim