diff --git a/pkgs/development/tools/ocaml/findlib/default.nix b/pkgs/development/tools/ocaml/findlib/default.nix
index b0d8326fc98d..4d8f48f6f1c7 100644
--- a/pkgs/development/tools/ocaml/findlib/default.nix
+++ b/pkgs/development/tools/ocaml/findlib/default.nix
@@ -39,10 +39,13 @@ stdenv.mkDerivation rec {
     "${placeholder "out"}/etc/findlib.conf"
   ];
 
-  buildFlags = [
-    "all"
-    "opt"
-  ];
+  buildFlags =
+    [
+      "all"
+    ]
+    ++ lib.optionals ocaml.nativeCompilers [
+      "opt"
+    ];
 
   setupHook = writeText "setupHook.sh" ''
     addOCamlPath () {