diff --git a/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlEnumTypeMapping.cs b/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlEnumTypeMapping.cs
index dcf7902e8..e9faf4f6c 100644
--- a/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlEnumTypeMapping.cs
+++ b/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlEnumTypeMapping.cs
@@ -10,27 +10,21 @@ namespace Npgsql.EntityFrameworkCore.PostgreSQL.Storage.Internal.Mapping
 {
     public class NpgsqlEnumTypeMapping : RelationalTypeMapping
     {
-        [NotNull] static readonly NpgsqlSqlGenerationHelper SqlGenerationHelper =
-            new NpgsqlSqlGenerationHelper(new RelationalSqlGenerationHelperDependencies());
-
+        [NotNull] readonly ISqlGenerationHelper _sqlGenerationHelper;
         [NotNull] readonly INpgsqlNameTranslator _nameTranslator;
 
-        [CanBeNull] readonly string _storeTypeSchema;
-
         /// <summary>
         /// Translates the CLR member value to the PostgreSQL value label.
         /// </summary>
         [NotNull] readonly Dictionary<object, string> _members;
 
-        [NotNull]
-        public override string StoreType => SqlGenerationHelper.DelimitIdentifier(base.StoreType, _storeTypeSchema);
-
         public NpgsqlEnumTypeMapping(
             [NotNull] string storeType,
             [CanBeNull] string storeTypeSchema,
             [NotNull] Type enumType,
+            [NotNull] ISqlGenerationHelper sqlGenerationHelper,
             [CanBeNull] INpgsqlNameTranslator nameTranslator = null)
-            : base(storeType, enumType)
+            : base(sqlGenerationHelper.DelimitIdentifier(storeType, storeTypeSchema), enumType)
         {
             if (!enumType.IsEnum || !enumType.IsValueType)
                 throw new ArgumentException($"Enum type mappings require a CLR enum. {enumType.FullName} is not an enum.");
@@ -39,23 +33,23 @@ public NpgsqlEnumTypeMapping(
                 nameTranslator = NpgsqlConnection.GlobalTypeMapper.DefaultNameTranslator;
 
             _nameTranslator = nameTranslator;
-            _storeTypeSchema = storeTypeSchema;
+            _sqlGenerationHelper = sqlGenerationHelper;
             _members = CreateValueMapping(enumType, nameTranslator);
         }
 
         protected NpgsqlEnumTypeMapping(
             RelationalTypeMappingParameters parameters,
-            [CanBeNull] string storeTypeSchema,
+            [NotNull] ISqlGenerationHelper sqlGenerationHelper,
             [NotNull] INpgsqlNameTranslator nameTranslator)
             : base(parameters)
         {
             _nameTranslator = nameTranslator;
-            _storeTypeSchema = storeTypeSchema;
+            _sqlGenerationHelper = sqlGenerationHelper;
             _members = CreateValueMapping(parameters.CoreParameters.ClrType, nameTranslator);
         }
 
         protected override RelationalTypeMapping Clone(RelationalTypeMappingParameters parameters)
-            => new NpgsqlEnumTypeMapping(parameters, _storeTypeSchema, _nameTranslator);
+            => new NpgsqlEnumTypeMapping(parameters, _sqlGenerationHelper, _nameTranslator);
 
         protected override string GenerateNonNullSqlLiteral(object value) => $"'{_members[value]}'::{StoreType}";
 
diff --git a/src/EFCore.PG/Storage/Internal/NpgsqlTypeMappingSource.cs b/src/EFCore.PG/Storage/Internal/NpgsqlTypeMappingSource.cs
index dd713f72f..f1ac717ea 100644
--- a/src/EFCore.PG/Storage/Internal/NpgsqlTypeMappingSource.cs
+++ b/src/EFCore.PG/Storage/Internal/NpgsqlTypeMappingSource.cs
@@ -244,7 +244,7 @@ public NpgsqlTypeMappingSource([NotNull] TypeMappingSourceDependencies dependenc
             StoreTypeMappings = new ConcurrentDictionary<string, RelationalTypeMapping[]>(storeTypeMappings, StringComparer.OrdinalIgnoreCase);
             ClrTypeMappings = new ConcurrentDictionary<Type, RelationalTypeMapping>(clrTypeMappings);
 
-            LoadUserDefinedTypeMappings();
+            LoadUserDefinedTypeMappings(sqlGenerationHelper);
 
             _userRangeDefinitions = npgsqlOptions?.UserRangeDefinitions ?? new UserRangeDefinition[0];
         }
@@ -253,15 +253,15 @@ public NpgsqlTypeMappingSource([NotNull] TypeMappingSourceDependencies dependenc
         /// To be used in case user-defined mappings are added late, after this TypeMappingSource has already been initialized.
         /// This is basically only for test usage.
         /// </summary>
-        public void LoadUserDefinedTypeMappings()
+        public void LoadUserDefinedTypeMappings([NotNull] ISqlGenerationHelper sqlGenerationHelper)
         {
-            SetupEnumMappings();
+            SetupEnumMappings(sqlGenerationHelper);
         }
 
         /// <summary>
         /// Gets all global enum mappings from the ADO.NET layer and creates mappings for them
         /// </summary>
-        void SetupEnumMappings()
+        void SetupEnumMappings([NotNull] ISqlGenerationHelper sqlGenerationHelper)
         {
             foreach (var adoMapping in NpgsqlConnection.GlobalTypeMapper.Mappings.Where(m => m.TypeHandlerFactory is IEnumTypeHandlerFactory))
             {
@@ -280,7 +280,7 @@ void SetupEnumMappings()
                 var schema = components.Length > 1 ? components.First() : null;
                 var name = components.Length > 1 ? string.Join(null, components.Skip(1)) : storeType;
 
-                var mapping = new NpgsqlEnumTypeMapping(name, schema, clrType, nameTranslator);
+                var mapping = new NpgsqlEnumTypeMapping(name, schema, clrType, sqlGenerationHelper, nameTranslator);
                 ClrTypeMappings[clrType] = mapping;
                 StoreTypeMappings[mapping.StoreType] = new RelationalTypeMapping[] { mapping };
             }
diff --git a/test/EFCore.PG.FunctionalTests/BuiltInDataTypesNpgsqlTest.cs b/test/EFCore.PG.FunctionalTests/BuiltInDataTypesNpgsqlTest.cs
index 159ab0e08..d554d3071 100644
--- a/test/EFCore.PG.FunctionalTests/BuiltInDataTypesNpgsqlTest.cs
+++ b/test/EFCore.PG.FunctionalTests/BuiltInDataTypesNpgsqlTest.cs
@@ -707,7 +707,7 @@ protected override void OnModelCreating(ModelBuilder modelBuilder, DbContext con
                 base.OnModelCreating(modelBuilder, context);
 
                 NpgsqlConnection.GlobalTypeMapper.MapEnum<Mood>();
-                ((NpgsqlTypeMappingSource)context.GetService<ITypeMappingSource>()).LoadUserDefinedTypeMappings();
+                ((NpgsqlTypeMappingSource)context.GetService<ITypeMappingSource>()).LoadUserDefinedTypeMappings(context.GetService<ISqlGenerationHelper>());
 
                 modelBuilder.HasPostgresExtension("hstore");
                 modelBuilder.ForNpgsqlHasEnum("mood", new[] { "happy", "sad" });
diff --git a/test/EFCore.PG.Tests/Storage/NpgsqlTypeMappingTest.cs b/test/EFCore.PG.Tests/Storage/NpgsqlTypeMappingTest.cs
index dfafd779b..29b31680e 100644
--- a/test/EFCore.PG.Tests/Storage/NpgsqlTypeMappingTest.cs
+++ b/test/EFCore.PG.Tests/Storage/NpgsqlTypeMappingTest.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
-using System.Collections.Immutable;
 using System.Net;
 using System.Net.NetworkInformation;
 using Microsoft.EntityFrameworkCore;
@@ -88,7 +87,7 @@ public void GenerateSqlLiteral_returns_timetz_literal()
             var mapping = GetMapping("timetz");
             Assert.Equal("TIMETZ '04:05:06.123456+3'",
                 mapping.GenerateSqlLiteral(new DateTimeOffset(2015, 3, 12, 4, 5, 6, 123, TimeSpan.FromHours(3))
-                .AddTicks(4560)));
+                    .AddTicks(4560)));
             Assert.Equal("TIMETZ '04:05:06.789+3'", mapping.GenerateSqlLiteral(new DateTimeOffset(2015, 3, 12, 4, 5, 6, 789, TimeSpan.FromHours(3))));
             Assert.Equal("TIMETZ '04:05:06-3'", mapping.GenerateSqlLiteral(new DateTimeOffset(2015, 3, 12, 4, 5, 6, TimeSpan.FromHours(-3))));
         }
@@ -280,8 +279,8 @@ public void ValueComparer_hstore_array()
             // This exercises array's comparer when the element has its own non-null comparer
             var source = new[]
             {
-                new Dictionary<string, string> { { "k1", "v1"} },
-                new Dictionary<string, string> { { "k2", "v2"} },
+                new Dictionary<string, string> { { "k1", "v1" } },
+                new Dictionary<string, string> { { "k2", "v2" } },
             };
 
             var comparer = GetMapping(typeof(Dictionary<string, string>[])).Comparer;
@@ -300,18 +299,18 @@ public void GenerateSqlLiteral_returns_bytea_literal()
         public void GenerateSqlLiteral_returns_hstore_literal()
             => Assert.Equal(@"HSTORE '""k1""=>""v1"",""k2""=>""v2""'",
                 GetMapping("hstore").GenerateSqlLiteral(new Dictionary<string, string>
-            {
-                { "k1", "v1" },
-                { "k2", "v2" }
-            }));
+                {
+                    { "k1", "v1" },
+                    { "k2", "v2" }
+                }));
 
         [Fact]
         public void ValueComparer_hstore()
         {
             var source = new Dictionary<string, string>
             {
-                { "k1", "v1"},
-                { "k2", "v2"}
+                { "k1", "v1" },
+                { "k2", "v2" }
             };
 
             var comparer = GetMapping("hstore").Comparer;
@@ -333,18 +332,34 @@ public void GenerateSqlLiteral_returns_json_literal()
         [Fact]
         public void GenerateSqlLiteral_returns_enum_literal()
         {
-            var mapping = new NpgsqlEnumTypeMapping("dummy_enum", null, typeof(DummyEnum), new NpgsqlSnakeCaseNameTranslator());
+            var mapping = new NpgsqlEnumTypeMapping(
+                "dummy_enum",
+                null,
+                typeof(DummyEnum),
+                new NpgsqlSqlGenerationHelper(new RelationalSqlGenerationHelperDependencies()),
+                new NpgsqlSnakeCaseNameTranslator());
+
             Assert.Equal("'sad'::dummy_enum", mapping.GenerateSqlLiteral(DummyEnum.Sad));
         }
 
         [Fact]
         public void GenerateSqlLiteral_returns_enum_uppercase_literal()
         {
-            var mapping = new NpgsqlEnumTypeMapping("DummyEnum", null, typeof(DummyEnum), new NpgsqlSnakeCaseNameTranslator());
+            var mapping = new NpgsqlEnumTypeMapping(
+                "DummyEnum",
+                null,
+                typeof(DummyEnum),
+                new NpgsqlSqlGenerationHelper(new RelationalSqlGenerationHelperDependencies()),
+                new NpgsqlSnakeCaseNameTranslator());
+
             Assert.Equal("'sad'::\"DummyEnum\"", mapping.GenerateSqlLiteral(DummyEnum.Sad));
         }
 
-        enum DummyEnum { Happy, Sad };
+        enum DummyEnum
+        {
+            Happy,
+            Sad
+        };
 
         [Fact]
         public void GenerateSqlLiteral_returns_tid_literal()