diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 432746a60913..f54734844a29 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -20839,7 +20839,9 @@ with pkgs;
     ocamlPackages = ocaml-ng.ocamlPackages_4_05;
   };
 
-  alt-ergo = callPackage ../applications/science/logic/alt-ergo { };
+  alt-ergo = callPackage ../applications/science/logic/alt-ergo {
+    ocamlPackages = ocaml-ng.ocamlPackages_4_05;
+  };
 
   aspino = callPackage ../applications/science/logic/aspino {};