diff --git search_api_xapian/search_api_xapian.install search_api_xapian/search_api_xapian.install
index 279fe46..f63abb7 100644
--- search_api_xapian/search_api_xapian.install
+++ search_api_xapian/search_api_xapian.install
@@ -14,6 +14,9 @@ define('SEARCH_API_XAPIAN_MINIMUM_BINDINGS', '1.0.2');
  * include error.
  */
 function search_api_xapian_requirements($phase) {
+  if (module_exists('xapian')) {
+    return array();
+  }
   $t = get_t();
   if (search_api_xapian_is_xapian_available()) {
     // Get Xapian bindings version, supporting PHP4 and PHP5 methods