diff --git a/src/locale_common.h b/src/locale_common.h
index e797cb015..9305ccfd0 100644
--- a/src/locale_common.h
+++ b/src/locale_common.h
@@ -305,7 +305,7 @@ MAKE_PSTR_ENUM(enum_hybridStrategy1, FL_(cost_optimized), FL_(co2_optimized), FL
 MAKE_PSTR_ENUM(enum_lowNoiseMode, FL_(off), FL_(reduced_output), FL_(switchoff), FL_(perm))
 
 // heat pump
-MAKE_PSTR_ENUM(enum_hpactivity, FL_(none), FL_(heating), FL_(cooling), FL_(hot_water), FL_(pool), FL_(nofrost))
+MAKE_PSTR_ENUM(enum_hpactivity, FL_(none), FL_(heating), FL_(cooling), FL_(hot_water), FL_(pool), FL_(defrost))
 
 // solar
 MAKE_PSTR_ENUM(enum_solarmode, FL_(constant), FL_(pwm), FL_(analog))
diff --git a/src/locale_translations.h b/src/locale_translations.h
index 32f890b36..b0115c64a 100644
--- a/src/locale_translations.h
+++ b/src/locale_translations.h
@@ -210,6 +210,7 @@ MAKE_PSTR_LIST(constant, "constant", "konstant", "constant", "Konstant", "stały
 MAKE_PSTR_LIST(simple, "simple", "einfach", "simpel", "enkel", "prosty", "enkel")
 MAKE_PSTR_LIST(optimized, "optimized", "optimiert", "geoptimaliseerd", "optimerad", "zoptymalizowany", "optimalisert")
 MAKE_PSTR_LIST(nofrost, "nofrost", "Frostschutz", "Vorstbescherming", "Frostskydd", "ochrona przed zamarzaniem", "frostsikring")
+MAKE_PSTR_LIST(defrost, "ndefrost", "Abtauen", "ontdooien", "avfrostning", "rozmrażać", "tine")
 MAKE_PSTR_LIST(comfort, "comfort", "Komfort", "Comfort", "Komfort", "komfort", "komfort")
 MAKE_PSTR_LIST(night, "night", "Nacht", "Nacht", "Natt", "noc", "natt")
 MAKE_PSTR_LIST(day, "day", "Tag", "Dag", "Dag", "dzień", "dag")