diff --git a/GeneratorInterface/LHEInterface/data/run_generic_tarball_cvmfs.sh b/GeneratorInterface/LHEInterface/data/run_generic_tarball_cvmfs.sh
index 5d5d8773e4637..837e2e1fb8963 100755
--- a/GeneratorInterface/LHEInterface/data/run_generic_tarball_cvmfs.sh
+++ b/GeneratorInterface/LHEInterface/data/run_generic_tarball_cvmfs.sh
@@ -69,20 +69,10 @@ tar -xaf ${path}
 # and fallback to /tmp
 export TMPDIR=${TMPDIR:-${_CONDOR_SCRATCH_DIR:-/tmp}}
 
-# define singularity
-if [ "$use_gridpack_env" != false ]; then
-    if [ -n "$scram_arch_version" ]; then
-        sing=$(echo ${scram_arch_version} | sed -E 's/^[^0-9]*([0-9]{1,2}).*/\1/')
-    elif egrep -q "scram_arch_version=[^$]" runcmsgrid.sh; then
-        sing=$(grep "scram_arch_version=[^$]" runcmsgrid.sh | sed -E 's/^[^0-9]*([0-9]{1,2}).*/\1/')
-    fi
-    if [ -n "${sing}" ]; then
-        sing="cmssw-el"${sing}" --"
-    fi
-fi
+
 
 #generate events
-${sing} ./runcmsgrid.sh $nevt $rnum $ncpu ${@:5}
+./runcmsgrid.sh $nevt $rnum $ncpu ${@:5}
 
 mv cmsgrid_final.lhe $LHEWORKDIR/