diff --git a/.package-lists/guix-emtecbase-manifest.scm b/.package-lists/guix-emtecbase-manifest.scm
index 20b72534..2fec00f6 100644
--- a/.package-lists/guix-emtecbase-manifest.scm
+++ b/.package-lists/guix-emtecbase-manifest.scm
@@ -1,5 +1,6 @@
 (specifications->manifest
- '("postgresql"
+ '("openssl"                            ; To decrypt instance data.
+   "postgresql"
    "postgis"
    ;; "python"
    "python-wrapper"                     ; Contains pip.