diff --git a/UserTools/LoadWCSim/LoadWCSim.cpp b/UserTools/LoadWCSim/LoadWCSim.cpp
index 854212030..2d737954c 100644
--- a/UserTools/LoadWCSim/LoadWCSim.cpp
+++ b/UserTools/LoadWCSim/LoadWCSim.cpp
@@ -978,8 +978,8 @@ Geometry* LoadWCSim::ConstructToolChainGeometry(){
 	double tank_ycentre = (wcsimrootgeom->GetWCOffset(1)) / 100.;
 	double tank_zcentre = (wcsimrootgeom->GetWCOffset(2)) / 100.;
 	Position tank_centre(tank_xcentre, tank_ycentre, tank_zcentre);
-	double tank_radius = (wcsimrootgeom->GetWCCylRadius()) / 100.;
-	double tank_halfheight = (wcsimrootgeom->GetWCCylLength()) / 100.;
+	double tank_radius = (wcsimrootgeom->GetWCCylRadius()) / 100.; //GetWCCylRadius() returns the black sheet radius not the tank radius
+	double tank_halfheight = (wcsimrootgeom->GetWCCylLength()) / 200.; //GetWCCylLength() returns the main annulus height not the tank height
 	//Currently hard-coded; estimated with a tape measure on the ANNIE frame :)
 	double pmt_enclosed_radius = 1.0;
 	double pmt_enclosed_halfheight = 1.45;