diff --git a/.package-lists/guix-manifest.scm b/.package-lists/guix-manifest.scm
index 8600f6e3..577a7463 100644
--- a/.package-lists/guix-manifest.scm
+++ b/.package-lists/guix-manifest.scm
@@ -103,6 +103,7 @@
     "emacs-restclient"
     "emacs-slime"
     "emacs-slime-company"
+    "emacs-slime-repl-ansi-color"
     "emacs-strace-mode"
     "emacs-sx"
     "emacs-synosaurus"