diff --git a/src/NHibernate/Dialect/Ingres9Dialect.cs b/src/NHibernate/Dialect/Ingres9Dialect.cs
index 1d7f9761b63..d1c9b544b43 100644
--- a/src/NHibernate/Dialect/Ingres9Dialect.cs
+++ b/src/NHibernate/Dialect/Ingres9Dialect.cs
@@ -1,3 +1,4 @@
+using NHibernate.Id;
 using NHibernate.SqlCommand;
 
 namespace NHibernate.Dialect
@@ -40,6 +41,16 @@ public override bool SupportsLimitOffset
 		/// <inheritdoc />
 		public override string QuerySequencesString => "select seq_name from iisequences";
 
+		/// <inheritdoc />
+		// 6.0 TODO: remove override for having default behavior when sequences are supported.
+		//           It has been put for minimizing breaking changes due to supporting sequences in 5.1.
+		public override System.Type IdentityStyleIdentifierGeneratorClass => typeof(TriggerIdentityGenerator);
+
+		/// <inheritdoc />
+		// 6.0 TODO: remove override for having default behavior when sequences are supported.
+		//           It has been put for minimizing breaking changes due to supporting sequences in 5.1.
+		public override System.Type NativeIdentifierGeneratorClass => typeof(TableHiLoGenerator);
+
 		/// <summary>
 		/// Attempts to add a <c>LIMIT</c> clause to the given SQL <c>SELECT</c>.
 		/// Expects any database-specific offset and limit adjustments to have already been performed (ex. UseMaxForLimit, OffsetStartsAtOne).