diff --git a/class-es-wp-query-shoehorn.php b/class-es-wp-query-shoehorn.php
index 3d7c938..cfd80b5 100644
--- a/class-es-wp-query-shoehorn.php
+++ b/class-es-wp-query-shoehorn.php
@@ -21,6 +21,11 @@ function es_wp_query_arg( $vars ) {
  * @return void
  */
 function es_wp_query_shoehorn( &$query ) {
+	// Prevent infinite loops!
+	if ( $query instanceof ES_WP_Query ) {
+		return;	
+	}
+	
 	if ( true == $query->get( 'es' ) ) {
 		$conditionals = array(
 			'is_single'            => false,
@@ -219,4 +224,4 @@ private function reboot_query_vars( &$query ) {
 			$q['posts_per_page'] = get_option( 'posts_per_page' );
 		}
 	}
-}
\ No newline at end of file
+}