diff --git a/FluidDynamics/Components/Buildings/WallLeaks.mo b/FluidDynamics/Components/Buildings/WallLeaks.mo
index b0ae77e89cc32b57a3a6aef1480e2a7d05ecff8d..58389366118bcdcc1aa919094c396f19ba3ba30a 100644
--- a/FluidDynamics/Components/Buildings/WallLeaks.mo
+++ b/FluidDynamics/Components/Buildings/WallLeaks.mo
@@ -1,7 +1,7 @@
 within TAeZoSysPro.FluidDynamics.Components.Buildings;
 
 model WallLeaks
-  package Medium = TAeZoSysPro.Media.MyMedia;
+  replaceable package Medium = TAeZoSysPro.Media.MyMedia;
   //
   parameter Modelica.SIunits.Area A "Wall surface area" annotation(
     Dialog(group = "Geometry"));