diff --git a/src/regionModels/pyrolysisModels/reactingOneDim/reactingOneDim.C b/src/regionModels/pyrolysisModels/reactingOneDim/reactingOneDim.C
index 36ff9f4cad..1e6a30627e 100644
--- a/src/regionModels/pyrolysisModels/reactingOneDim/reactingOneDim.C
+++ b/src/regionModels/pyrolysisModels/reactingOneDim/reactingOneDim.C
@@ -32,6 +32,7 @@ License
 #include "fvcVolumeIntegrate.H"
 #include "fvMatrices.H"
 #include "absorptionEmissionModel.H"
+#include "fvcLaplacian.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //