diff --git a/driver_scripts/driver_grid.orion.sh b/driver_scripts/driver_grid.orion.sh
index e0ac9fc4e..c0190f4d9 100755
--- a/driver_scripts/driver_grid.orion.sh
+++ b/driver_scripts/driver_grid.orion.sh
@@ -161,7 +161,7 @@ export OMP_NUM_THREADS=24
 export OMP_STACKSIZE=2048m
 
 ulimit -a
-ulimit -s 199000000
+ulimit -s unlimited
 
 #-----------------------------------------------------------------------
 # Start script.