diff --git a/sites/all/modules/contrib/og_subgroups/og_subgroups.module b/sites/all/modules/contrib/og_subgroups/og_subgroups.module
index f55ba1b..91c12a1 100755
--- a/sites/all/modules/contrib/og_subgroups/og_subgroups.module
+++ b/sites/all/modules/contrib/og_subgroups/og_subgroups.module
@@ -5,12 +5,14 @@
  * Enable defining hierarchy of groups for organic groups.
  */
 
+define('OG_SUBGROUPS_REQUIRED_CTOOLS_API', '2.0-alpha');
+
 /**
  * Implementation of hook_ctools_plugin_directory().
  */
 function og_subgroups_ctools_plugin_directory($module, $plugin) {
   // Safety: go away if CTools is not at an appropriate version.
-  if (!module_invoke('ctools', 'api_version', OG_REQUIRED_CTOOLS_API)) {
+  if (!module_invoke('ctools', 'api_version', OG_SUBGROUPS_REQUIRED_CTOOLS_API)) {
     return;
   }
 
@@ -18,6 +20,7 @@ function og_subgroups_ctools_plugin_directory($module, $plugin) {
     return 'plugins/' . $plugin;
   }
 }
+
 /**
  * Check if a user has access permission in one of the ancestors groups
  * and return the tree structure of the group hierarchy.