diff --git a/pkgs/development/coq-modules/category-theory/default.nix b/pkgs/development/coq-modules/category-theory/default.nix
index 795c177bc80..a5e4dd92116 100644
--- a/pkgs/development/coq-modules/category-theory/default.nix
+++ b/pkgs/development/coq-modules/category-theory/default.nix
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
   };
 
   buildInputs = [ coq.ocaml coq.camlp5 coq.findlib ];
-  propagatedBuildInputs = [ coq ssreflect ];
+  propagatedBuildInputs = [ coq ssreflect equations ];
 
   enableParallelBuilding = false;