diff --git a/src/main/java/com/samskivert/depot/impl/BuildVisitor.java b/src/main/java/com/samskivert/depot/impl/BuildVisitor.java
index 635263a..23937c5 100644
--- a/src/main/java/com/samskivert/depot/impl/BuildVisitor.java
+++ b/src/main/java/com/samskivert/depot/impl/BuildVisitor.java
@@ -467,7 +467,8 @@ public abstract class BuildVisitor implements FragmentVisitor<Void>
             _builder.append(" = ");
             if (pojo != null) {
                 bindField(pClass, fields[ii], pojo);
-
+            } else if (values[ii] instanceof ValueExp<?>) {
+                bindFieldValue(pClass, fields[ii], (ValueExp<?>)values[ii]);
             } else {
                 values[ii].accept(this);
             }
@@ -747,18 +748,61 @@ public abstract class BuildVisitor implements FragmentVisitor<Void>
         return null;
     }
 
-    protected Void bindValue (Object object)
+    protected Void bindValue (final Object value)
     {
-        _bindables.add(newBindable(object));
+        _bindables.add(new Bindable() {
+            public void doBind (Connection conn, PreparedStatement stmt, int argIx)
+                throws Exception {
+                // TODO: how can we abstract this fieldless marshalling
+                if (value instanceof ByteEnum) {
+                    // byte enums require special conversion
+                    stmt.setByte(argIx, ((ByteEnum)value).toByte());
+                } else if (value instanceof Enum<?>) {
+                    // enums are converted to strings
+                    stmt.setString(argIx, ((Enum<?>)value).name());
+                } else if (value instanceof int[]) {
+                    // int arrays require conversion to byte arrays
+                    int[] data = (int[])value;
+                    ByteBuffer bbuf = ByteBuffer.allocate(data.length * 4);
+                    bbuf.asIntBuffer().put(data);
+                    stmt.setObject(argIx, bbuf.array());
+                } else {
+                    stmt.setObject(argIx, value);
+                }
+            }
+        });
         _builder.append("?");
         return null;
     }
 
     protected Void bindField (
-        Class<? extends PersistentRecord> pClass, ColumnExp<?> field, Object pojo)
+        Class<? extends PersistentRecord> pClass, ColumnExp<?> field, final Object pojo)
     {
-        final DepotMarshaller<?> marshaller = _types.getMarshaller(pClass);
-        _bindables.add(newBindable(marshaller, field, pojo));
+        final FieldMarshaller<?> fmarsh =
+            _types.getMarshaller(pClass).getFieldMarshaller(field.name);
+        _bindables.add(new Bindable() {
+            public void doBind (Connection conn, PreparedStatement stmt, int argIx)
+                throws Exception {
+                fmarsh.getAndWriteToStatement(stmt, argIx, pojo);
+            }
+        });
+        _builder.append("?");
+        return null;
+    }
+
+    protected <T> Void bindFieldValue (
+        Class<? extends PersistentRecord> pClass, ColumnExp<?> field, final ValueExp<T> value)
+    {
+        // we know that the Ts match in FieldMarshaller<T> and ValueExp<T>, but it's hard
+        // to convince the type system of that
+        final @SuppressWarnings("unchecked") FieldMarshaller<T> fmarsh =
+            (FieldMarshaller<T>)_types.getMarshaller(pClass).getFieldMarshaller(field.name);
+        _bindables.add(new Bindable() {
+            public void doBind (Connection conn, PreparedStatement stmt, int argIx)
+                throws Exception {
+                fmarsh.writeToStatement(stmt, argIx, value.getValue());
+            }
+        });
         _builder.append("?");
         return null;
     }
@@ -936,42 +980,6 @@ public abstract class BuildVisitor implements FragmentVisitor<Void>
         void doBind (Connection conn, PreparedStatement stmt, int argIx) throws Exception;
     }
 
-    protected static Bindable newBindable (
-        final DepotMarshaller<?> marshaller, final ColumnExp<?> field, final Object pojo)
-    {
-        return new Bindable() {
-            public void doBind (Connection conn, PreparedStatement stmt, int argIx)
-                throws Exception {
-                marshaller.getFieldMarshaller(field.name).getAndWriteToStatement(stmt, argIx, pojo);
-            }
-        };
-    }
-
-    protected static Bindable newBindable (final Object value)
-    {
-        return new Bindable() {
-            public void doBind (Connection conn, PreparedStatement stmt, int argIx)
-                throws Exception {
-                // TODO: how can we abstract this fieldless marshalling
-                if (value instanceof ByteEnum) {
-                    // byte enums require special conversion
-                    stmt.setByte(argIx, ((ByteEnum)value).toByte());
-                } else if (value instanceof Enum<?>) {
-                    // enums are converted to strings
-                    stmt.setString(argIx, ((Enum<?>)value).name());
-                } else if (value instanceof int[]) {
-                    // int arrays require conversion to byte arrays
-                    int[] data = (int[])value;
-                    ByteBuffer bbuf = ByteBuffer.allocate(data.length * 4);
-                    bbuf.asIntBuffer().put(data);
-                    stmt.setObject(argIx, bbuf.array());
-                } else {
-                    stmt.setObject(argIx, value);
-                }
-            }
-        };
-    }
-
     protected DepotTypes _types;
 
     /** For each SQL parameter ? we add an {@link Comparable} to bind to this list. */
diff --git a/src/test/java/com/samskivert/depot/TransformTest.java b/src/test/java/com/samskivert/depot/TransformTest.java
index 0f8381a..3f5f6b1 100644
--- a/src/test/java/com/samskivert/depot/TransformTest.java
+++ b/src/test/java/com/samskivert/depot/TransformTest.java
@@ -240,6 +240,19 @@ public class TransformTest extends TestBase
         delete(in);
     }
 
+    @Test public void testUpdatePartial ()
+    {
+        TransformRecord in = createAndInsert(new String[] { "one", "two", "three" });
+
+        EnumSet<ExtraOrdinal> nbobs = EnumSet.of(ExtraOrdinal.ONE, ExtraOrdinal.THREE);
+        _repo.updatePartial(TransformRecord.getKey(in.recordId), TransformRecord.BOBS, nbobs);
+
+        TransformRecord in2 = _repo.load(TransformRecord.getKey(in.recordId));
+        assertEquals(nbobs, in2.bobs);
+
+        delete(in);
+    }
+
     protected TransformRecord createAndInsert (String[] strings)
     {
         TransformRecord in = new TransformRecord();