diff --git a/xml/convertHeatConductionToMPL.py b/xml/convertHeatConductionToMPL.py
index ce10f95a63cb42de2f48598fefb56aa8682b8b26..2b1bd065452304965edd4c9c89105e03fd015c52 100755
--- a/xml/convertHeatConductionToMPL.py
+++ b/xml/convertHeatConductionToMPL.py
@@ -422,6 +422,7 @@ def processFile(filename):
         # Medium
         ("thermal_conductivity", "Medium", "thermal_conductivity"),
         ("specific_heat_capacity", "Medium", "specific_heat_capacity"),
+        ("density", "Medium", "density"),
         ("heat_capacity", "Medium", "heat_capacity"),
         ("temperature", "Medium", "reference_temperature"),
         # Liquid