diff --git a/flakes/manual.toml b/flakes/manual.toml
index af85db9..1256f19 100644
--- a/flakes/manual.toml
+++ b/flakes/manual.toml
@@ -108,3 +108,8 @@ url = "git+https://codeberg.org/wolfangaukang/multifirefox?ref=main"
 type = "github"
 owner = "juliosueiras-nix"
 repo = "nix-security"
+
+[[sources]]
+type = "github"
+owner = "input-output-hk"
+repo = "haskell.nix"