diff --git a/tutorials/basic/potentialFoam/cylinder/Allrun b/tutorials/basic/potentialFoam/cylinder/Allrun
index 219e4473de..bb35ba990c 100755
--- a/tutorials/basic/potentialFoam/cylinder/Allrun
+++ b/tutorials/basic/potentialFoam/cylinder/Allrun
@@ -6,6 +6,32 @@ cd ${0%/*} || exit 1    # run from this directory
 
 application=`getApplication`
 
+
+# This case uses the #codeStream which is disabled by default. Enable for
+# just this case.
+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
+
+    # Clean up on termination and on Ctrl-C
+    trap 'mv ${MAIN_CONTROL_DICT}.org ${MAIN_CONTROL_DICT} 2>/dev/null; exit 0' \
+        EXIT TERM INT
+    cp ${MAIN_CONTROL_DICT} ${MAIN_CONTROL_DICT}.org
+
+    echo "Enabling allowSystemOperations in ${MAIN_CONTROL_DICT}."
+
+    sed \
+    -e s/"\(allowSystemOperations[ \t]*\)\([0-9]\);"/"\1 1;"/g \
+    ${MAIN_CONTROL_DICT}.org > ${MAIN_CONTROL_DICT}
+fi
+
 cp -r 0.org 0 > /dev/null 2>&1
 runApplication blockMesh
 runApplication $application