diff --git a/tutorials/incompressible/porousSimpleFoam/straightDuctImplicit/Allrun b/tutorials/incompressible/porousSimpleFoam/straightDuctImplicit/Allrun
index f3df03720..b9793e43a 100755
--- a/tutorials/incompressible/porousSimpleFoam/straightDuctImplicit/Allrun
+++ b/tutorials/incompressible/porousSimpleFoam/straightDuctImplicit/Allrun
@@ -4,8 +4,11 @@ cd ${0%/*} || exit 1    # Run from this directory
 # Source tutorial run functions
 . $WM_PROJECT_DIR/bin/tools/RunFunctions
 
-./Allrun.pre
+if [ -n "$FOAMY_HEX_MESH" ]
+then
+    ./Allrun.pre
 
-runApplication `getApplication`
+    runApplication `getApplication`
+fi
 
 #------------------------------------------------------------------------------