diff --git a/jOOQ/src/main/java/org/jooq/impl/Cast.java b/jOOQ/src/main/java/org/jooq/impl/Cast.java
index 14a2932f67..c4717ae721 100644
--- a/jOOQ/src/main/java/org/jooq/impl/Cast.java
+++ b/jOOQ/src/main/java/org/jooq/impl/Cast.java
@@ -51,6 +51,7 @@ import static org.jooq.impl.SQLDataType.DECIMAL;
 import static org.jooq.impl.SQLDataType.DOUBLE;
 import static org.jooq.impl.SQLDataType.FLOAT;
 import static org.jooq.impl.SQLDataType.REAL;
+import static org.jooq.impl.SQLDataType.VARCHAR;
 
 import java.sql.Date;
 import java.sql.Time;
@@ -103,6 +104,10 @@ final class Cast<T> extends AbstractField<T> {
 
 
 
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             case DERBY:
                 ctx.visit(new CastDerby());
                 break;
@@ -159,7 +164,32 @@ final class Cast<T> extends AbstractField<T> {
 
 
 
-    private class CastDerby extends CastNative<T> {
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+    private final class CastDerby extends CastNative<T> {
 
         /**
          * Generated UID