diff --git a/tutorials/incompressible/simpleFoam/roomResidenceTime/validation/plotPos1Data.gplt b/tutorials/incompressible/simpleFoam/roomResidenceTime/validation/plotPos1Data.gplt
old mode 100755
new mode 100644
index 536beefcd1..fd752ff082
--- a/tutorials/incompressible/simpleFoam/roomResidenceTime/validation/plotPos1Data.gplt
+++ b/tutorials/incompressible/simpleFoam/roomResidenceTime/validation/plotPos1Data.gplt
@@ -1,4 +1,3 @@
-#!/bin/gnuplot
 #------------------------------------------------------------------------------
 set grid
 set title "Comparison at x =1.13 m, y = 1.8 m"
diff --git a/tutorials/incompressible/simpleFoam/roomResidenceTime/validation/plotPos2Data.gplt b/tutorials/incompressible/simpleFoam/roomResidenceTime/validation/plotPos2Data.gplt
old mode 100755
new mode 100644
index 18e0e553b0..0013ca58e4
--- a/tutorials/incompressible/simpleFoam/roomResidenceTime/validation/plotPos2Data.gplt
+++ b/tutorials/incompressible/simpleFoam/roomResidenceTime/validation/plotPos2Data.gplt
@@ -1,4 +1,3 @@
-#!/bin/gnuplot
 #------------------------------------------------------------------------------
 set grid
 set title "Comparison at x = 3.2 m, y = 1.8 m"