diff --git a/cmake-ide.el b/cmake-ide.el
index 20654be..5b1a526 100644
--- a/cmake-ide.el
+++ b/cmake-ide.el
@@ -45,6 +45,7 @@
 (require 'cl-lib)
 (require 'seq)
 (require 's)
+(require 'subr-x)
 
 (declare-function rtags-call-rc "rtags")