diff --git a/src/main/java/io/ebean/config/dbplatform/DbIdentity.java b/src/main/java/io/ebean/config/dbplatform/DbIdentity.java
index 6e8a8562c..af1f4574c 100644
--- a/src/main/java/io/ebean/config/dbplatform/DbIdentity.java
+++ b/src/main/java/io/ebean/config/dbplatform/DbIdentity.java
@@ -1,6 +1,5 @@
 package io.ebean.config.dbplatform;
 
-import io.ebeaninternal.dbmigration.migration.IdentityType;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -121,28 +120,4 @@ public class DbIdentity {
     this.idType = idType;
   }
 
-  /**
-   * Determine the id type to use based on requested identityType and
-   * the support for that in the database platform.
-   */
-  public IdType useIdentityType(IdentityType identityType) {
-
-    if (identityType == null) {
-      // use the default
-      return idType;
-    }
-    switch (identityType) {
-      case GENERATOR:
-        return IdType.GENERATOR;
-      case EXTERNAL:
-        return IdType.EXTERNAL;
-      case SEQUENCE:
-        return supportsSequence ? IdType.SEQUENCE : idType;
-      case IDENTITY:
-        return supportsIdentity ? IdType.IDENTITY : idType;
-      default:
-        return idType;
-    }
-
-  }
 }
diff --git a/src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl.java b/src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl.java
index c1ee013c9..c870608f2 100644
--- a/src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl.java
+++ b/src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl.java
@@ -136,9 +136,33 @@ public class PlatformDdl {
    * Return the identity type to use given the support in the underlying database
    * platform for sequences and identity/autoincrement.
    */
-  public IdType useIdentityType(IdentityType modelIdentityType) {
+  public IdType useIdentityType(IdentityType modelIdentity) {
 
-    return dbIdentity.useIdentityType(modelIdentityType);
+    if (modelIdentity == null) {
+      // use the default
+      return dbIdentity.getIdType();
+    }
+    return identityType(modelIdentity, dbIdentity.getIdType(), dbIdentity.isSupportsSequence(), dbIdentity.isSupportsIdentity());
+  }
+
+  /**
+   * Determine the id type to use based on requested identityType and
+   * the support for that in the database platform.
+   */
+  private IdType identityType(IdentityType modelIdentity, IdType platformIdType, boolean supportsSequence, boolean supportsIdentity) {
+
+    switch (modelIdentity) {
+      case GENERATOR:
+        return IdType.GENERATOR;
+      case EXTERNAL:
+        return IdType.EXTERNAL;
+      case SEQUENCE:
+        return supportsSequence ? IdType.SEQUENCE : platformIdType;
+      case IDENTITY:
+        return supportsIdentity ? IdType.IDENTITY : platformIdType;
+      default:
+        return platformIdType;
+    }
   }
 
   /**
diff --git a/src/main/java/io/ebeaninternal/server/core/PlatformDdlBuilder.java b/src/main/java/io/ebeaninternal/server/core/PlatformDdlBuilder.java
index 13b31d816..560bc519e 100644
--- a/src/main/java/io/ebeaninternal/server/core/PlatformDdlBuilder.java
+++ b/src/main/java/io/ebeaninternal/server/core/PlatformDdlBuilder.java
@@ -11,9 +11,14 @@ import io.ebeaninternal.dbmigration.ddlgeneration.platform.PostgresDdl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.SQLiteDdl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.SqlServerDdl;
 
+/**
+ * Builds platform specific DDL handler.
+ */
 public class PlatformDdlBuilder {
 
-
+  /**
+   * Return platform specific DDL handler.
+   */
   public static PlatformDdl create(DatabasePlatform platform) {
 
     switch (platform.getPlatform()) {
diff --git a/src/test/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl_AlterColumnTest.java b/src/test/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl_AlterColumnTest.java
index 0e4d5e556..59d538518 100644
--- a/src/test/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl_AlterColumnTest.java
+++ b/src/test/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl_AlterColumnTest.java
@@ -2,12 +2,14 @@ package io.ebeaninternal.dbmigration.ddlgeneration.platform;
 
 import io.ebean.Ebean;
 import io.ebean.config.ServerConfig;
+import io.ebean.config.dbplatform.IdType;
 import io.ebean.config.dbplatform.h2.H2Platform;
 import io.ebean.config.dbplatform.sqlserver.SqlServerPlatform;
 import io.ebean.config.dbplatform.mysql.MySqlPlatform;
 import io.ebean.config.dbplatform.oracle.OraclePlatform;
 import io.ebean.config.dbplatform.postgres.PostgresPlatform;
 import io.ebeaninternal.dbmigration.migration.AlterColumn;
+import io.ebeaninternal.dbmigration.migration.IdentityType;
 import io.ebeaninternal.server.core.PlatformDdlBuilder;
 import org.junit.Test;
 
@@ -17,16 +19,17 @@ import static org.junit.Assert.assertNull;
 
 public class PlatformDdl_AlterColumnTest {
 
-  PlatformDdl h2Ddl = PlatformDdlBuilder.create(new H2Platform());
-  PlatformDdl pgDdl = PlatformDdlBuilder.create(new PostgresPlatform());
-  PlatformDdl mysqlDdl = PlatformDdlBuilder.create(new MySqlPlatform());
-  PlatformDdl oraDdl = PlatformDdlBuilder.create(new OraclePlatform());
-  PlatformDdl sqlServerDdl = PlatformDdlBuilder.create(new SqlServerPlatform());
+  private PlatformDdl h2Ddl = PlatformDdlBuilder.create(new H2Platform());
+  private PlatformDdl pgDdl = PlatformDdlBuilder.create(new PostgresPlatform());
+  private PlatformDdl mysqlDdl = PlatformDdlBuilder.create(new MySqlPlatform());
+  private PlatformDdl oraDdl = PlatformDdlBuilder.create(new OraclePlatform());
+  private PlatformDdl sqlServerDdl = PlatformDdlBuilder.create(new SqlServerPlatform());
 
   {
     ServerConfig serverConfig = Ebean.getDefaultServer().getPluginApi().getServerConfig();
     sqlServerDdl.configure(serverConfig);
   }
+
   AlterColumn alterNotNull() {
     AlterColumn alterColumn = new AlterColumn();
     alterColumn.setTableName("mytab");
@@ -185,4 +188,42 @@ public class PlatformDdl_AlterColumnTest {
     assertThat(sql).startsWith("delimiter $$").endsWith("$$");
   }
 
+  @Test
+  public void useIdentityType_h2() {
+    assertEquals(h2Ddl.useIdentityType(null), IdType.IDENTITY);
+    assertEquals(h2Ddl.useIdentityType(IdentityType.SEQUENCE), IdType.SEQUENCE);
+    assertEquals(h2Ddl.useIdentityType(IdentityType.IDENTITY), IdType.IDENTITY);
+    assertEquals(h2Ddl.useIdentityType(IdentityType.GENERATOR), IdType.GENERATOR);
+    assertEquals(h2Ddl.useIdentityType(IdentityType.EXTERNAL), IdType.EXTERNAL);
+  }
+
+  @Test
+  public void useIdentityType_postgres() {
+    assertEquals(pgDdl.useIdentityType(IdentityType.GENERATOR), IdType.GENERATOR);
+    assertEquals(pgDdl.useIdentityType(IdentityType.EXTERNAL), IdType.EXTERNAL);
+
+    assertEquals(pgDdl.useIdentityType(null), IdType.IDENTITY);
+    assertEquals(pgDdl.useIdentityType(IdentityType.SEQUENCE), IdType.SEQUENCE);
+    assertEquals(pgDdl.useIdentityType(IdentityType.IDENTITY), IdType.IDENTITY);
+  }
+
+  @Test
+  public void useIdentityType_mysql() {
+
+    assertEquals(mysqlDdl.useIdentityType(null), IdType.IDENTITY);
+    assertEquals(mysqlDdl.useIdentityType(IdentityType.SEQUENCE), IdType.IDENTITY);
+    assertEquals(mysqlDdl.useIdentityType(IdentityType.IDENTITY), IdType.IDENTITY);
+    assertEquals(mysqlDdl.useIdentityType(IdentityType.GENERATOR), IdType.GENERATOR);
+    assertEquals(mysqlDdl.useIdentityType(IdentityType.EXTERNAL), IdType.EXTERNAL);
+  }
+
+  @Test
+  public void useIdentityType_oracle() {
+
+    assertEquals(oraDdl.useIdentityType(null), IdType.SEQUENCE);
+    assertEquals(oraDdl.useIdentityType(IdentityType.SEQUENCE), IdType.SEQUENCE);
+    assertEquals(oraDdl.useIdentityType(IdentityType.IDENTITY), IdType.SEQUENCE);
+    assertEquals(oraDdl.useIdentityType(IdentityType.GENERATOR), IdType.GENERATOR);
+    assertEquals(oraDdl.useIdentityType(IdentityType.EXTERNAL), IdType.EXTERNAL);
+  }
 }