diff --git a/tutorials/combustion/fireFoam/les/smallPoolFire2D/constant/combustionProperties b/tutorials/combustion/fireFoam/les/smallPoolFire2D/constant/combustionProperties
index 9973e9ad7b..1576592b91 100644
--- a/tutorials/combustion/fireFoam/les/smallPoolFire2D/constant/combustionProperties
+++ b/tutorials/combustion/fireFoam/les/smallPoolFire2D/constant/combustionProperties
@@ -23,7 +23,8 @@ active  true;
 
 infinitelyFastChemistryCoeffs
 {
-    C       5.0;
+    semiImplicit no;
+    C           5.0;
 }
 
 FSDCoeffs
diff --git a/tutorials/combustion/fireFoam/les/smallPoolFire3D/constant/combustionProperties b/tutorials/combustion/fireFoam/les/smallPoolFire3D/constant/combustionProperties
index cfa2cd8f28..689dc54c62 100644
--- a/tutorials/combustion/fireFoam/les/smallPoolFire3D/constant/combustionProperties
+++ b/tutorials/combustion/fireFoam/les/smallPoolFire3D/constant/combustionProperties
@@ -22,6 +22,7 @@ active  on;
 
 infinitelyFastChemistryCoeffs
 {
+    semiImplicit no;
     C       5.0;
 }