diff --git a/glicid/packages/file-systems.scm b/glicid/packages/file-systems.scm
index 2166419..8fa853d 100644
--- a/glicid/packages/file-systems.scm
+++ b/glicid/packages/file-systems.scm
@@ -14,6 +14,7 @@
   #:use-module (gnu packages openldap)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages bison)
+  #:use-module (gnu packages flex)
 
 )