diff --git a/entityreference.install b/entityreference.install
index b48a84e..0b87bb4 100644
--- a/entityreference.install
+++ b/entityreference.install
@@ -40,6 +40,7 @@ function entityreference_field_schema($field) {
       );
     }
 
+    module_load_include('module', 'entityreference');
     // Invoke the behaviors to allow them to change the schema.
     foreach (entityreference_get_behavior_handlers($field) as $handler) {
       $handler->schema_alter($schema, $field);