diff --git a/pkgs/ovni/default.nix b/pkgs/ovni/default.nix
index d4ab78c..8d40aa4 100644
--- a/pkgs/ovni/default.nix
+++ b/pkgs/ovni/default.nix
@@ -38,6 +38,9 @@ in
   stdenv.mkDerivation rec {
     pname = "ovni";
     inherit (source) src version;
+    postPatch = ''
+      patchShebangs --build test/
+    '';
     buildInputs = [ cmake mpi ];
     cmakeBuildType = if (enableDebug) then "Debug" else "Release";
     cmakeFlags = [ "-DOVNI_GIT_COMMIT=${src.shortRev}" ];