diff --git a/build-aux/hydra/gnu-system.scm b/build-aux/hydra/gnu-system.scm
index 507c6abe0e..b1faa2265a 100644
--- a/build-aux/hydra/gnu-system.scm
+++ b/build-aux/hydra/gnu-system.scm
@@ -111,7 +111,7 @@ (define %core-packages
   ;; chain.)
   (list gcc-4.8 gcc-4.9 gcc-5 glibc binutils
         gmp mpfr mpc coreutils findutils diffutils patch sed grep
-        gawk gnu-gettext hello guile-2.0 zlib gzip xz
+        gawk gnu-gettext hello guile-2.0 guile-2.2 zlib gzip xz
         %bootstrap-binaries-tarball
         %binutils-bootstrap-tarball
         (%glibc-bootstrap-tarball)