diff --git a/ProcessLib/ComponentTransport/ComponentTransportFEM.h b/ProcessLib/ComponentTransport/ComponentTransportFEM.h
index 875deeef7d86770ed59125b9fef2b7933263885e..31577841dfcb0d34c428bab72b020b035f9dc6dd 100644
--- a/ProcessLib/ComponentTransport/ComponentTransportFEM.h
+++ b/ProcessLib/ComponentTransport/ComponentTransportFEM.h
@@ -192,7 +192,8 @@ public:
 
             _ip_data[ip].porosity =
                 medium->property(MaterialPropertyLib::PropertyType::porosity)
-                    .template initialValue<double>(pos, 0.);
+                    .template initialValue<double>(
+                        pos, std::numeric_limits<double>::quiet_NaN() /*t*/);
         }
     }