diff --git a/shell/ShellRC.hs b/shell/ShellRC.hs
index 71a04898fab72eb9aebd675e31dd819c048ce97f..1df234c6e3ae3eb9b65b229d7f7163f472dfa2a6 100644
--- a/shell/ShellRC.hs
+++ b/shell/ShellRC.hs
@@ -16,6 +16,7 @@ import qualified Data.Map                  as Map
 import           Data.Text                 (Text)
 import qualified Data.Text                 as T
 import qualified Data.Text.Encoding        as T
+import qualified Data.Vector               as V
 import qualified Data.Yaml                 as Y
 import qualified Data.Yaml.Pretty          as Y
 import           Horizon.Spec
diff --git a/shell/default.nix b/shell/default.nix
index 82d9f15784076ee0c2f56b0d1af9ada82ec7d46e..96ef3efa3590e465260fcc045b557f558c256da0 100644
--- a/shell/default.nix
+++ b/shell/default.nix
@@ -20,6 +20,7 @@ let
     path
     procex
     text
+    vector
     yaml
   ]);