diff --git a/src/madl_esurv.mad b/src/madl_esurv.mad
index cc3ba960f..490ea6cbe 100644
--- a/src/madl_esurv.mad
+++ b/src/madl_esurv.mad
@@ -229,7 +229,7 @@ local function track_thin (elm, m)
   m.el, m.ang = 0, angle*m.tdir
 
   local kick = abs(angle) >= minang and curex_thin or fnil
-  trackelm(elm, m, thinonly, kick)
+  trackelm(elm, m, thinonly, kick, nil, fnil)
 end
 
 local function track_thick (elm, m, fng_)