diff --git a/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/MySqlDdl.java b/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/MySqlDdl.java
index 692d575b7..4e6276b1d 100644
--- a/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/MySqlDdl.java
+++ b/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/MySqlDdl.java
@@ -71,6 +71,7 @@ public class MySqlDdl extends PlatformDdl {
     String tableName = alter.getTableName();
     String columnName = alter.getColumnName();
     String type = alter.getType() != null ? alter.getType() : alter.getCurrentType();
+    type = convert(type, false);
     boolean notnull = (alter.isNotnull() != null) ? alter.isNotnull() : Boolean.TRUE.equals(alter.isCurrentNotnull());
     String notnullClause = notnull ? " not null" : "";
 
diff --git a/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/PlatformDdl.java b/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/PlatformDdl.java
index c8af9346a..3843507cf 100644
--- a/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/PlatformDdl.java
+++ b/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/PlatformDdl.java
@@ -376,7 +376,7 @@ public class PlatformDdl {
    */
   public String alterColumnType(String tableName, String columnName, String type) {
 
-    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + columnSetType + type;
+    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + columnSetType + convert(type, false);
   }
 
   /**
diff --git a/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/SqlServerDdl.java b/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/SqlServerDdl.java
index 6b5814274..953848198 100644
--- a/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/SqlServerDdl.java
+++ b/src/main/java/io/ebean/dbmigration/ddlgeneration/platform/SqlServerDdl.java
@@ -70,6 +70,7 @@ public class SqlServerDdl extends PlatformDdl {
     String tableName = alter.getTableName();
     String columnName = alter.getColumnName();
     String type = alter.getType() != null ? alter.getType() : alter.getCurrentType();
+    type = convert(type, false);
     boolean notnull = (alter.isNotnull() != null) ? alter.isNotnull() : Boolean.TRUE.equals(alter.isCurrentNotnull());
     String notnullClause = notnull ? " not null" : "";
 
diff --git a/src/test/java/io/ebean/dbmigration/ddlgeneration/platform/PlatformDdl_AlterColumnTest.java b/src/test/java/io/ebean/dbmigration/ddlgeneration/platform/PlatformDdl_AlterColumnTest.java
index 8cb72ad12..66d6e72b3 100644
--- a/src/test/java/io/ebean/dbmigration/ddlgeneration/platform/PlatformDdl_AlterColumnTest.java
+++ b/src/test/java/io/ebean/dbmigration/ddlgeneration/platform/PlatformDdl_AlterColumnTest.java
@@ -68,7 +68,7 @@ public class PlatformDdl_AlterColumnTest {
     assertEquals("alter table mytab alter column acol type varchar(20)", sql);
 
     sql = oraDdl.alterColumnType("mytab", "acol", "varchar(20)");
-    assertEquals("alter table mytab modify acol varchar(20)", sql);
+    assertEquals("alter table mytab modify acol varchar2(20)", sql);
 
     sql = mysqlDdl.alterColumnType("mytab", "acol", "varchar(20)");
     assertNull(sql);