diff --git a/src/UNL/Catalog/CourseSearch/DBSearcher.php b/src/UNL/Catalog/CourseSearch/DBSearcher.php
index cffd42fbaf2ef762ebff46d0b4bf552d12515a81..1650ad1759374c2da3e9a9e372e486cb7d8f44e4 100644
--- a/src/UNL/Catalog/CourseSearch/DBSearcher.php
+++ b/src/UNL/Catalog/CourseSearch/DBSearcher.php
@@ -4,7 +4,7 @@ class UNL_Catalog_CourseSearch_DBSearcher extends UNL_UndergraduateBulletin_Cour
 
     function getQueryResult($query, $offset = 0, $limit = -1)
     {
-        $query =  'SELECT DISTINCT courses.id, courses.xml FROM courses INNER JOIN crosslistings c1 ON courses.id=c1.course_id INNER JOIN crosslistings ON courses.id=crosslistings.course_id WHERE c1.courseNumber >= "500" AND (' . $query . ');';
+        $query =  'SELECT DISTINCT courses.id, courses.xml FROM courses INNER JOIN crosslistings c1 ON courses.id=c1.course_id INNER JOIN crosslistings ON courses.id=crosslistings.course_id WHERE c1.courseNumber >= "500" AND c1.courseNumber != crosslistings.courseNumber AND (' . $query . ');';
         return new UNL_UndergraduateBulletin_CourseSearch_DBSearchResults($query, $offset, $limit);
     }
 }
\ No newline at end of file