diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 1421abfc111..5b2fadd4dab 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -478,7 +478,9 @@ let
 
     metrics-lwt = callPackage ../development/ocaml-modules/metrics/lwt.nix { };
 
-    metrics-unix = callPackage ../development/ocaml-modules/metrics/unix.nix { };
+    metrics-unix = callPackage ../development/ocaml-modules/metrics/unix.nix {
+      inherit (pkgs) gnuplot;
+    };
 
     mezzo = callPackage ../development/compilers/mezzo { };