diff --git a/nix/frama-ci.nix b/nix/frama-ci.nix
index b71b4dc788b1fae3d160b9699089aaecd55f7f0c..be59be5c7e77798ef6d1ec757e0b8a6171481807 100644
--- a/nix/frama-ci.nix
+++ b/nix/frama-ci.nix
@@ -5,8 +5,8 @@ let
     src = builtins.fetchGit {
             "url" = "https://bobot:${password}@git.frama-c.com/frama-c/Frama-CI.git";
             "name" = "Frama-CI";
-            "rev" = "22ccb4e8951b6ac6eb62b0b0c6a53f9a98c94951";
-            "ref" = "master";
+            "rev" = "4dd9d4def36be28bba9751d652bd8849eeca505a";
+            "ref" = "fix/nix/easy-format";
     };
     pkgs = import "${src}/pkgs.nix" {};
  in