diff --git a/src/simulation/elements/TUGN.cpp b/src/simulation/elements/TUGN.cpp
index e77047863..2c2c2369c 100644
--- a/src/simulation/elements/TUGN.cpp
+++ b/src/simulation/elements/TUGN.cpp
@@ -96,6 +96,12 @@ int Element_TUGN::update(UPDATE_FUNC_ARGS)
 		parts[i].vy += (rand()%100)-50;
 		return 1;
 	} 
+	parts[i].pavg[0] = parts[i].pavg[1];
+	parts[i].pavg[1] = sim->pv[y/CELL][x/CELL];
+	if (parts[i].pavg[1]-parts[i].pavg[0] > 0.50f || parts[i].pavg[1]-parts[i].pavg[0] < -0.50f)
+	{
+		sim->part_change_type(i,x,y,PT_BRMT);
+	}
 	return 0;
 }