diff --git a/tutorials/basic/potentialFoam/cylinder/Allrun b/tutorials/basic/potentialFoam/cylinder/Allrun
index bb35ba990c..b9695da975 100755
--- a/tutorials/basic/potentialFoam/cylinder/Allrun
+++ b/tutorials/basic/potentialFoam/cylinder/Allrun
@@ -12,24 +12,18 @@ application=`getApplication`
 MAIN_CONTROL_DICT=`foamEtcFile controlDict`
 if [ -f "$MAIN_CONTROL_DICT" ]
 then
-    echo "Modifying ${MAIN_CONTROL_DICT}"
-    if [ -e ${MAIN_CONTROL_DICT}.org ]
-    then
-        echo "File ${MAIN_CONTROL_DICT}.org already exists"
-        echo "Did Allrun fail in some way and then run again?"
-        exit 1
-    fi
+    echo "Modifying ${MAIN_CONTROL_DICT} to enable allowSystemOperations"
 
     # Clean up on termination and on Ctrl-C
-    trap 'mv ${MAIN_CONTROL_DICT}.org ${MAIN_CONTROL_DICT} 2>/dev/null; exit 0' \
+    trap 'mv ${MAIN_CONTROL_DICT}.$$ ${MAIN_CONTROL_DICT} 2>/dev/null; exit 0' \
         EXIT TERM INT
-    cp ${MAIN_CONTROL_DICT} ${MAIN_CONTROL_DICT}.org
+    cp ${MAIN_CONTROL_DICT} ${MAIN_CONTROL_DICT}.$$
 
     echo "Enabling allowSystemOperations in ${MAIN_CONTROL_DICT}."
 
     sed \
     -e s/"\(allowSystemOperations[ \t]*\)\([0-9]\);"/"\1 1;"/g \
-    ${MAIN_CONTROL_DICT}.org > ${MAIN_CONTROL_DICT}
+    ${MAIN_CONTROL_DICT}.$$ > ${MAIN_CONTROL_DICT}
 fi
 
 cp -r 0.org 0 > /dev/null 2>&1