diff --git a/pkgs/development/ocaml-modules/pyml/default.nix b/pkgs/development/ocaml-modules/pyml/default.nix
index 1cc85833d58..8358be50032 100644
--- a/pkgs/development/ocaml-modules/pyml/default.nix
+++ b/pkgs/development/ocaml-modules/pyml/default.nix
@@ -28,6 +28,10 @@ buildDunePackage rec {
         "CHANGES.md"
       ];
     })
+    (fetchpatch {
+      url = "https://github.com/thierry-martinez/pyml/commit/97407473800b3f6215190643c1e6b9bd25d5caeb.patch";
+      hash = "sha256-7CrVuV4JT7fyi/ktWz4nNOG/BbqsQVCoJwCAhE2y4YU=";
+    })
   ];
 
   buildInputs = [
@@ -40,7 +44,7 @@ buildDunePackage rec {
   ];
 
   nativeCheckInputs = [
-    python3.pkgs.numpy
+    python3.pkgs.numpy python3.pkgs.ipython
   ];
 
   strictDeps = true;