diff --git a/scripts/nuissamples b/scripts/nuissamples
index 7721fe5..22d72ce 100755
--- a/scripts/nuissamples
+++ b/scripts/nuissamples
@@ -1,19 +1,27 @@
-#!/bin/sh
+#!/bin/bash
+
+if [[ -z ${NUISANCE} ]]; then
+  echo "NUISANCE environment variable is not set"
+  echo "Getting the sample list depends on this"
+  echo "Please do:" 
+  echo "export NUISANCE=YOUR_INSTALL && ./nuissamples"
+  exit
+fi
 
 for line in $(grep compare $NUISANCE/src/FCN/SampleList.cxx); do
-  if [[ $line != *"compare"* ]]; then
+  if [[ "${line}" != *"compare"* ]]; then
     continue
   fi
   line=${line//\!name\.compare\(/}
   line=${line//\(/}
   line=${line//\)/}
   line=${line//\"/}
   line=${line//\{}
 
   if [[ $line != *"$1"* ]];
   then
     continue
   fi
 
   echo ${2}${line}${3}
 done