diff --git a/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/enthalpySourceProperties b/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/enthalpySourceProperties
index 614c9a41b3..9c1295cc93 100644
--- a/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/enthalpySourceProperties
+++ b/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/enthalpySourceProperties
@@ -15,6 +15,8 @@ FoamFile
 }
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+active          yes;
+
 cellSource      sphereToCell;
 
 volumeType      absolute;
diff --git a/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/system/controlDict b/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/system/controlDict
index 6cc0b6002c..50cd97415e 100644
--- a/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/system/controlDict
+++ b/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/system/controlDict
@@ -47,7 +47,7 @@ runTimeModifiable yes;
 
 adjustTimeStep  yes;
 
-maxCo           0.2;
+maxCo           1.0;
 
 maxDeltaT       1;