diff --git a/Cantera/src/oneD/Domain1D.h b/Cantera/src/oneD/Domain1D.h
index d09f18858..595f9d26d 100644
--- a/Cantera/src/oneD/Domain1D.h
+++ b/Cantera/src/oneD/Domain1D.h
@@ -28,7 +28,8 @@ namespace Cantera {
     const int cSymmType         = 105;
     const int cOutletType       = 106;
     const int cEmptyType        = 107;
-    const int cOutletResType       = 108;
+    const int cOutletResType    = 108;
+    const int cPorousType       = 109;
 
     class MultiJac;
     class OneDim;