diff --git a/org-ql-agenda.el b/org-ql-agenda.el
index 5cc58a5..b11fbf0 100644
--- a/org-ql-agenda.el
+++ b/org-ql-agenda.el
@@ -35,10 +35,12 @@
 (require 'org)
 (require 'org-agenda)
 (require 'seq)
+(require 'rx)
 
 (require 'org-ql)
 
 (require 'dash)
+(require 's)
 
 ;;;; Variables
 
diff --git a/org-ql.el b/org-ql.el
index baec414..64c278b 100644
--- a/org-ql.el
+++ b/org-ql.el
@@ -3,7 +3,7 @@
 ;; Author: Adam Porter <adam@alphapapa.net>
 ;; Url: http://github.com/alphapapa/org-ql
 ;; Version: 0.1-pre
-;; Package-Requires: ((emacs "25.1") (dash "2.13") (org "9.0"))
+;; Package-Requires: ((emacs "25.1") (dash "2.13") (org "9.0") (s "1.12.0"))
 ;; Keywords: hypermedia, outlines, Org, agenda
 
 ;;; Commentary:
@@ -21,6 +21,7 @@
 (require 'org)
 (require 'org-habit)
 (require 'seq)
+(require 'subr-x)
 
 (require 'dash)