diff --git a/source/java/org/alfresco/repo/forms/PropertyFieldDefinition.java b/source/java/org/alfresco/repo/forms/PropertyFieldDefinition.java
index c567e3d766..eac45db64d 100644
--- a/source/java/org/alfresco/repo/forms/PropertyFieldDefinition.java
+++ b/source/java/org/alfresco/repo/forms/PropertyFieldDefinition.java
@@ -182,7 +182,7 @@ public class PropertyFieldDefinition extends FieldDefinition
     /**
      * Represents a constraint on a property field
      */
-    public class FieldConstraint
+    public static class FieldConstraint
     {
         protected String type;
         protected Map<String, Object> params;