diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index ba3abf469dce..171e217a2bc7 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -589,7 +589,7 @@ let
               };
           in
           {
-            ppx_deriving_0_15 = ppx_deriving_ "0.15";
+            ppx_deriving_0_15 = ppx_deriving_ "0.15.0";
             ppx_deriving_0_33 = ppx_deriving_ "0.33.0";
           }
         );