diff --git a/zha/application/platforms/climate/const.py b/zha/application/platforms/climate/const.py
index d1c0e291..17fe4d94 100644
--- a/zha/application/platforms/climate/const.py
+++ b/zha/application/platforms/climate/const.py
@@ -132,6 +132,7 @@ class HVACAction(StrEnum):
     """HVAC action for climate devices."""
 
     COOLING = "cooling"
+    DEFROSTING = "defrosting"
     DRYING = "drying"
     FAN = "fan"
     HEATING = "heating"