diff --git a/adsense_search.install b/adsense_search.install
index febdb2e..0d2ae40 100644
--- a/adsense_search.install
+++ b/adsense_search.install
@@ -10,9 +10,13 @@
  */
 function adsense_search_uninstall() {
   // Remove module variables
-  $result = db_query("SELECT name FROM {variable} WHERE name LIKE 'adsense_search__%'");
-  while ($var_name = db_result($result)) {
-    variable_del($var_name);
+  $sql = db_query("SELECT name FROM {variable} WHERE name LIKE 'adsense_search__%'",
+    array('adsense_search_%'))->fetchCol();
+  $count = count($sql);
+  if ($count != 0) {
+    for ($i = 0; $i <= $count; $i++) {
+       variable_del($sql[$i]);
+    }
   }
 }