diff --git a/src/EFCore.PG/Query/ExpressionTranslators/Internal/NpgsqlDateTimeMemberTranslator.cs b/src/EFCore.PG/Query/ExpressionTranslators/Internal/NpgsqlDateTimeMemberTranslator.cs
index a709728ee..d83544d38 100644
--- a/src/EFCore.PG/Query/ExpressionTranslators/Internal/NpgsqlDateTimeMemberTranslator.cs
+++ b/src/EFCore.PG/Query/ExpressionTranslators/Internal/NpgsqlDateTimeMemberTranslator.cs
@@ -67,7 +67,7 @@ public NpgsqlDateTimeMemberTranslator(IRelationalTypeMappingSource typeMappingSo
             switch (instance)
             {
                 case { TypeMapping: NpgsqlTimestampTypeMapping }:
-                case { TypeMapping: NpgsqlTimestampTzTypeMapping } when NpgsqlTypeMappingSource.LegacyTimestampBehavior:
+                case { } when NpgsqlTypeMappingSource.LegacyTimestampBehavior:
                     return _sqlExpressionFactory.Function(
                         "date_trunc",
                         new[] { _sqlExpressionFactory.Constant("day"), instance },