diff --git a/nix/default.nix b/nix/default.nix
index 5e3ef8515c6787f4bdc4b2df9b799ea6bad3990f..6b45d562bccf9479c2534a502b34618bcb5e692c 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -76,6 +76,7 @@ rec {
         inherit src;
         buildInputs =
           (mk_buildInputs {
+            nixPackages = [ pkgs.bc ];
             opamPackages = [
               { name = "ocp-indent"; constraint = "=1.7.0"; }
               { name = "headache"; constraint = "=1.05"; }