diff --git a/src/Functions/DateTimeTransforms.h b/src/Functions/DateTimeTransforms.h
index 065f08296d0..da2e443523d 100644
--- a/src/Functions/DateTimeTransforms.h
+++ b/src/Functions/DateTimeTransforms.h
@@ -183,7 +183,7 @@ struct ToLastDayOfMonthImpl
 {
     static constexpr auto name = "toLastDayOfMonth";
 
-    static inline UInt16 execute(Int64 t, const DateLUTImpl & time_zone)
+    static inline Int64 execute(Int64 t, const DateLUTImpl & time_zone)
     {
         return time_zone.toLastDayNumOfMonth(time_zone.toDayNum(t));
     }
@@ -191,7 +191,7 @@ struct ToLastDayOfMonthImpl
     {
         return time_zone.toLastDayNumOfMonth(time_zone.toDayNum(t));
     }
-    static inline UInt16 execute(Int32 d, const DateLUTImpl & time_zone)
+    static inline Int32 execute(Int32 d, const DateLUTImpl & time_zone)
     {
         return time_zone.toLastDayNumOfMonth(ExtendedDayNum(d));
     }
diff --git a/src/Functions/toLastDayOfMonth.cpp b/src/Functions/toLastDayOfMonth.cpp
index 38d42521f00..cc67e6f7efc 100644
--- a/src/Functions/toLastDayOfMonth.cpp
+++ b/src/Functions/toLastDayOfMonth.cpp
@@ -6,7 +6,7 @@
 namespace DB
 {
 
-using FunctionToLastDayOfMonth = FunctionDateOrDateTimeToSomething<DataTypeDate, ToLastDayOfMonthImpl>;
+using FunctionToLastDayOfMonth = FunctionDateOrDateTimeToSomething<DataTypeDate32, ToLastDayOfMonthImpl>;
 
 REGISTER_FUNCTION(ToLastDayOfMonth)
 {