diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index 5fd3f367..dc785d39 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -9,6 +9,9 @@
 
     <!-- types are add, fix, remove, update -->
     <release version="0.8.5" date="2013-10-xx" description="v0.8.5">
+      <action dev="scolebourne" type="fix">
+        Fix code generation or private immutable builders. Fixes #26.
+      </action>
       <action dev="scolebourne" type="fix">
         Parse trailing comments on property definitions. Fixes #27.
       </action>
diff --git a/src/main/java/org/joda/beans/gen/BeanGen.java b/src/main/java/org/joda/beans/gen/BeanGen.java
index b69d661f..f3e6c1cc 100644
--- a/src/main/java/org/joda/beans/gen/BeanGen.java
+++ b/src/main/java/org/joda/beans/gen/BeanGen.java
@@ -999,7 +999,8 @@ private void generateBuilderClass() {
             generateBuilderProperties();
         }
         insertRegion.add("");
-        generateBuilderConstructor();
+        generateBuilderConstructorNoArgs();
+        generateBuilderConstructorCopy();
         generateIndentedSeparator();
         generateBuilderSet();
         generateBuilderBuilder();
@@ -1011,7 +1012,7 @@ private void generateBuilderClass() {
         insertRegion.add("");
     }
 
-    private void generateBuilderConstructor() {
+    private void generateBuilderConstructorNoArgs() {
         insertRegion.add("\t\t/**");
         insertRegion.add("\t\t * Restricted constructor.");
         insertRegion.add("\t\t */");
@@ -1019,20 +1020,24 @@ private void generateBuilderConstructor() {
         insertRegion.add("\t\t\tsuper(" + data.getTypeRaw() + ".Meta.INSTANCE);");
         insertRegion.add("\t\t}");
         insertRegion.add("");
-        
-        List<PropertyGen> nonDerived = nonDerivedProperties();
-        if (nonDerived.size() > 0) {
-            insertRegion.add("\t\t/**");
-            insertRegion.add("\t\t * Restricted copy constructor.");
-            insertRegion.add("\t\t * @param beanToCopy  the bean to copy from, not null");
-            insertRegion.add("\t\t */");
-            insertRegion.add("\t\tprivate Builder(" + data.getTypeNoExtends() + " beanToCopy) {");
-            insertRegion.add("\t\t\tsuper(" + data.getTypeRaw() + ".Meta.INSTANCE);");
-            for (int i = 0; i < nonDerived.size(); i++) {
-                insertRegion.addAll(nonDerived.get(i).generateBuilderConstructorAssign("beanToCopy"));
+    }
+
+    private void generateBuilderConstructorCopy() {
+        if (data.isEffectiveBuilderScopePublic()) {
+            List<PropertyGen> nonDerived = nonDerivedProperties();
+            if (nonDerived.size() > 0) {
+                insertRegion.add("\t\t/**");
+                insertRegion.add("\t\t * Restricted copy constructor.");
+                insertRegion.add("\t\t * @param beanToCopy  the bean to copy from, not null");
+                insertRegion.add("\t\t */");
+                insertRegion.add("\t\tprivate Builder(" + data.getTypeNoExtends() + " beanToCopy) {");
+                insertRegion.add("\t\t\tsuper(" + data.getTypeRaw() + ".Meta.INSTANCE);");
+                for (int i = 0; i < nonDerived.size(); i++) {
+                    insertRegion.addAll(nonDerived.get(i).generateBuilderConstructorAssign("beanToCopy"));
+                }
+                insertRegion.add("\t\t}");
+                insertRegion.add("");
             }
-            insertRegion.add("\t\t}");
-            insertRegion.add("");
         }
     }
 
diff --git a/src/test/java/org/joda/beans/gen/ImmGenericArray.java b/src/test/java/org/joda/beans/gen/ImmGenericArray.java
index 8ddd5b9e..a2a1b4ed 100644
--- a/src/test/java/org/joda/beans/gen/ImmGenericArray.java
+++ b/src/test/java/org/joda/beans/gen/ImmGenericArray.java
@@ -234,15 +234,6 @@ private Builder() {
             super(ImmGenericArray.Meta.INSTANCE);
         }
 
-        /**
-         * Restricted copy constructor.
-         * @param beanToCopy  the bean to copy from, not null
-         */
-        private Builder(ImmGenericArray<T> beanToCopy) {
-            super(ImmGenericArray.Meta.INSTANCE);
-            this.values = beanToCopy.getValues();
-        }
-
         //-----------------------------------------------------------------------
         @SuppressWarnings("unchecked")
         @Override