diff --git a/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlArrayTypeMapping.cs b/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlArrayTypeMapping.cs
index 052d653e4..a336b1148 100644
--- a/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlArrayTypeMapping.cs
+++ b/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlArrayTypeMapping.cs
@@ -190,7 +190,7 @@ protected NpgsqlArrayTypeMapping(RelationalTypeMappingParameters parameters)
         // Otherwise let the ADO.NET layer infer the PostgreSQL type. We can't always let it infer, otherwise
         // when given a byte[] it will infer byte (but we want smallint[])
         NpgsqlDbType = NpgsqlTypes.NpgsqlDbType.Array
-            | (ElementTypeMapping is INpgsqlTypeMapping elementNpgsqlTypeMapping
+            | (ElementTypeMapping is INpgsqlTypeMapping { NpgsqlDbType: not NpgsqlTypes.NpgsqlDbType.Unknown } elementNpgsqlTypeMapping
                 ? elementNpgsqlTypeMapping.NpgsqlDbType
                 : ElementTypeMapping.DbType.HasValue
                     ? new NpgsqlParameter { DbType = ElementTypeMapping.DbType.Value }.NpgsqlDbType