diff --git a/jOOQ/src/main/java/org/jooq/impl/CustomCondition.java b/jOOQ/src/main/java/org/jooq/impl/CustomCondition.java
index 8b3b314e46..f9e1bdf8dd 100644
--- a/jOOQ/src/main/java/org/jooq/impl/CustomCondition.java
+++ b/jOOQ/src/main/java/org/jooq/impl/CustomCondition.java
@@ -60,7 +60,7 @@ import org.jooq.impl.QOM.UOpaque;
  *
  * @author Lukas Eder
  */
-public non-sealed abstract class CustomCondition
+public /* non-sealed */ abstract class CustomCondition
 extends
     AbstractCondition
 implements
diff --git a/jOOQ/src/main/java/org/jooq/impl/CustomField.java b/jOOQ/src/main/java/org/jooq/impl/CustomField.java
index 4f83823ab9..b361146003 100644
--- a/jOOQ/src/main/java/org/jooq/impl/CustomField.java
+++ b/jOOQ/src/main/java/org/jooq/impl/CustomField.java
@@ -63,7 +63,7 @@ import org.jooq.impl.QOM.UOpaque;
  *
  * @author Lukas Eder
  */
-public non-sealed abstract class CustomField<T>
+public /* non-sealed */ abstract class CustomField<T>
 extends
     AbstractField<T>
 implements
diff --git a/jOOQ/src/main/java/org/jooq/impl/CustomQueryPart.java b/jOOQ/src/main/java/org/jooq/impl/CustomQueryPart.java
index 2796944a90..217f081b53 100644
--- a/jOOQ/src/main/java/org/jooq/impl/CustomQueryPart.java
+++ b/jOOQ/src/main/java/org/jooq/impl/CustomQueryPart.java
@@ -73,7 +73,7 @@ import org.jooq.impl.QOM.UOpaque;
  *
  * @author Lukas Eder
  */
-public non-sealed abstract class CustomQueryPart extends AbstractQueryPart implements UOpaque {
+public /* non-sealed */ abstract class CustomQueryPart extends AbstractQueryPart implements UOpaque {
 
     private static final Clause[] CLAUSES = { CUSTOM };
 
diff --git a/jOOQ/src/main/java/org/jooq/impl/CustomTable.java b/jOOQ/src/main/java/org/jooq/impl/CustomTable.java
index 5aff6e57e9..53a1456534 100644
--- a/jOOQ/src/main/java/org/jooq/impl/CustomTable.java
+++ b/jOOQ/src/main/java/org/jooq/impl/CustomTable.java
@@ -75,7 +75,7 @@ import org.jooq.impl.QOM.UOpaque;
  *
  * @author Lukas Eder
  */
-public non-sealed abstract class CustomTable<R extends TableRecord<R>>
+public /* non-sealed */ abstract class CustomTable<R extends TableRecord<R>>
 extends
     TableImpl<R>
 implements