--- og.install.old	2007-05-27 20:15:50.000000000 +0930
+++ og.install	2007-05-27 20:16:29.000000000 +0930
@@ -87,10 +87,16 @@
       ");
       break;
   }
-  _block_rehash(); // enable standard og blocks
   drupal_set_message(t('Organic groups module enabled. Please see the included readme.txt file for further installation instructions.'));
 }
 
+/**
+ * Implementation of hook_enable().
+ */
+function og_enable() {
+  _block_rehash(); // enable standard og blocks
+}
+
 // 2006-05-31 PFM: deletes row if present in the table.  The first parameter
 // is a table, the next two are arrays of fields and values
 // respectively.  Two values are supported.