diff --git a/hibernate-core/src/test/java/org/hibernate/test/hbm/uk/UniqueDelegateTest.java b/hibernate-core/src/test/java/org/hibernate/test/hbm/uk/UniqueDelegateTest.java
new file mode 100644
index 0000000000..13bc7d9287
--- /dev/null
+++ b/hibernate-core/src/test/java/org/hibernate/test/hbm/uk/UniqueDelegateTest.java
@@ -0,0 +1,136 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.test.hbm.uk;
+
+import java.util.Collections;
+
+import org.hibernate.boot.Metadata;
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistry;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+import org.hibernate.cfg.AvailableSettings;
+import org.hibernate.dialect.Dialect;
+import org.hibernate.dialect.H2Dialect;
+import org.hibernate.dialect.unique.DefaultUniqueDelegate;
+import org.hibernate.dialect.unique.UniqueDelegate;
+import org.hibernate.mapping.Column;
+import org.hibernate.mapping.Table;
+import org.hibernate.mapping.UniqueKey;
+import org.hibernate.tool.schema.spi.SchemaCreator;
+import org.hibernate.tool.schema.spi.SchemaDropper;
+import org.hibernate.tool.schema.spi.SchemaManagementTool;
+
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.testing.junit4.BaseUnitTestCase;
+import org.hibernate.test.hbm.index.JournalingSchemaToolingTarget;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+/**
+ * @author Steve Ebersole
+ */
+public class UniqueDelegateTest extends BaseUnitTestCase {
+	private static int getColumnDefinitionUniquenessFragmentCallCount = 0;
+	private static int getTableCreationUniqueConstraintsFragmentCallCount = 0;
+	private static int getAlterTableToAddUniqueKeyCommandCallCount = 0;
+	private static int getAlterTableToDropUniqueKeyCommandCallCount = 0;
+
+	private StandardServiceRegistry ssr;
+
+	@Before
+	public void before() {
+		ssr = new StandardServiceRegistryBuilder()
+				.applySetting( AvailableSettings.DIALECT, MyDialect.class )
+				.build();
+	}
+
+	@After
+	public void after() {
+		if ( ssr != null ) {
+			StandardServiceRegistryBuilder.destroy( ssr );
+		}
+	}
+
+	@Test
+	@TestForIssue( jiraKey = "HHH-10203" )
+	public void testUniqueDelegateConsulted() {
+		final Metadata metadata = new MetadataSources( ssr )
+				.addResource( "org/hibernate/test/hbm/uk/person_unique.hbm.xml" )
+				.buildMetadata();
+
+		final JournalingSchemaToolingTarget target = new JournalingSchemaToolingTarget();
+		final SchemaCreator schemaCreator = ssr.getService( SchemaManagementTool.class ).getSchemaCreator( Collections.emptyMap() );
+		schemaCreator.doCreation( metadata, false, target );
+
+		assertThat( getAlterTableToAddUniqueKeyCommandCallCount, equalTo( 1 ) );
+		assertThat( getColumnDefinitionUniquenessFragmentCallCount, equalTo( 1 ) );
+		assertThat( getTableCreationUniqueConstraintsFragmentCallCount, equalTo( 0 ) );
+
+		final SchemaDropper schemaDropper = ssr.getService( SchemaManagementTool.class ).getSchemaDropper( Collections.emptyMap() );
+		schemaDropper.doDrop( metadata, false, target );
+
+		// unique keys are not dropped explicitly
+		assertThat( getAlterTableToAddUniqueKeyCommandCallCount, equalTo( 1 ) );
+		assertThat( getColumnDefinitionUniquenessFragmentCallCount, equalTo( 1 ) );
+		assertThat( getTableCreationUniqueConstraintsFragmentCallCount, equalTo( 0 ) );
+	}
+
+	public static class MyDialect extends H2Dialect {
+		private MyUniqueDelegate myUniqueDelegate;
+
+		public MyDialect() {
+			this.myUniqueDelegate = new MyUniqueDelegate( this );
+		}
+
+		@Override
+		public UniqueDelegate getUniqueDelegate() {
+			return myUniqueDelegate;
+		}
+	}
+
+	public static class MyUniqueDelegate extends DefaultUniqueDelegate {
+
+		/**
+		 * Constructs DefaultUniqueDelegate
+		 *
+		 * @param dialect The dialect for which we are handling unique constraints
+		 */
+		public MyUniqueDelegate(Dialect dialect) {
+			super( dialect );
+		}
+
+		@Override
+		public String getColumnDefinitionUniquenessFragment(Column column) {
+			getColumnDefinitionUniquenessFragmentCallCount++;
+			return super.getColumnDefinitionUniquenessFragment( column );
+		}
+
+		@Override
+		public String getTableCreationUniqueConstraintsFragment(Table table) {
+			getTableCreationUniqueConstraintsFragmentCallCount++;
+			return super.getTableCreationUniqueConstraintsFragment( table );
+		}
+
+		@Override
+		public String getAlterTableToAddUniqueKeyCommand(
+				UniqueKey uniqueKey, Metadata metadata) {
+			getAlterTableToAddUniqueKeyCommandCallCount++;
+			return super.getAlterTableToAddUniqueKeyCommand( uniqueKey, metadata );
+		}
+
+		@Override
+		public String getAlterTableToDropUniqueKeyCommand(
+				UniqueKey uniqueKey, Metadata metadata) {
+			getAlterTableToDropUniqueKeyCommandCallCount++;
+			return super.getAlterTableToDropUniqueKeyCommand( uniqueKey, metadata );
+		}
+	}
+}
diff --git a/hibernate-core/src/test/resources/org/hibernate/test/hbm/fk/person_set.hbm.xml b/hibernate-core/src/test/resources/org/hibernate/test/hbm/fk/person_set.hbm.xml
index 363a0e7126..f19dc7145d 100644
--- a/hibernate-core/src/test/resources/org/hibernate/test/hbm/fk/person_set.hbm.xml
+++ b/hibernate-core/src/test/resources/org/hibernate/test/hbm/fk/person_set.hbm.xml
@@ -9,7 +9,7 @@
         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 
-<hibernate-mapping package="org.hibernate.hibernate5.constraintname">
+<hibernate-mapping package="org.hibernate.test.hbm.index">
 
     <class name="PersonGroup">
         <id name="id" type="long">
diff --git a/hibernate-core/src/test/resources/org/hibernate/test/hbm/uk/person_unique.hbm.xml b/hibernate-core/src/test/resources/org/hibernate/test/hbm/uk/person_unique.hbm.xml
new file mode 100644
index 0000000000..78bfbd601f
--- /dev/null
+++ b/hibernate-core/src/test/resources/org/hibernate/test/hbm/uk/person_unique.hbm.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0"?>
+<!--
+  ~ Hibernate, Relational Persistence for Idiomatic Java
+  ~
+  ~ License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+  ~ See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+  -->
+<!DOCTYPE hibernate-mapping PUBLIC
+        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
+        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
+
+<hibernate-mapping package="org.hibernate.test.hbm.index">
+
+    <class name="Person">
+
+        <id name="id" type="long">
+            <generator class="native" />
+        </id>
+        <property name="name" type="string" not-null="true" unique="true" />
+    </class>
+
+</hibernate-mapping>
\ No newline at end of file