diff --git a/cck.install b/cck.install
index 49a2f9b2c..82da480b1 100644
--- a/cck.install
+++ b/cck.install
@@ -3,7 +3,7 @@
  * Implementation of hook_install().
  */
 function cck_install() {
-  
+
 }
 
 /**
@@ -15,15 +15,21 @@ function cck_uninstall() {
 
 /**
  * Implementation of hook_schema.
- * 
+ *
  * Create a table to hold data for field settings CCK is managing,
- * like custom PHP code for Allowed values and default values that we 
+ * like custom PHP code for Allowed values and default values that we
  * don't want in core.
  */
 function cck_schema() {
- 
+
   $schema['cck_field_settings'] = array(
     'fields' => array(
+     'id' => array(
+       'description' => 'The unique identifier for this cache segment.',
+       'type' => 'serial',
+       'unsigned' => TRUE,
+       'not null' => TRUE,
+     ),
       'field_name' => array(
         'type' => 'varchar',
         'length' => 32,
@@ -48,7 +54,7 @@ function cck_schema() {
         'length' => 32,
         'not null' => FALSE,
         'description' => 'The name of the language, NULL for field settings.',
-      ),     
+      ),
       'setting_type' => array(
         'type' => 'varchar',
         'length' => 32,
@@ -89,7 +95,25 @@ function cck_update_7000() {
       'length' => 32,
       'not null' => FALSE,
       'description' => 'The name of the language, NULL for field settings.',
-    );     
+    );
     db_add_field('cck_field_settings', 'language', $field);
   }
 }
+
+/**
+ * Add a primary key.
+ */
+function cck_update_7001() {
+  if (!db_field_exists('cck_field_settings', 'id')) {
+    db_add_field('cck_field_settings', 'id',
+      array(
+        'description' => 'The unique identifier for this cache segment.',
+        'type' => 'serial',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+      ),
+      array('primary key' => array('id')));
+  }
+  // Add a primary key.
+  db_add_primary_key('cck_field_settings', array('id'));
+}