diff --git a/src/vaillant/08.hmu.HW5103.tsp b/src/vaillant/08.hmu.HW5103.tsp
index 4eaad730..b16826bf 100644
--- a/src/vaillant/08.hmu.HW5103.tsp
+++ b/src/vaillant/08.hmu.HW5103.tsp
@@ -208,7 +208,7 @@ namespace Hmu_HW5103 {
   @inherit(r_2)
   @ext(0x3c)
   model BuildingCircuitFlow {
-    @unit("l/h")
+    @unit("L/h")
     value: UIN;
   }