diff --git a/pkgs/by-name/la/lammps/package.nix b/pkgs/by-name/la/lammps/package.nix
index d25664c8f85e..df446f759588 100644
--- a/pkgs/by-name/la/lammps/package.nix
+++ b/pkgs/by-name/la/lammps/package.nix
@@ -40,7 +40,6 @@
     SRD = true;
     REAXFF = true;
     PYTHON = true;
-    MPIIO = true;
   },
   # Extra cmakeFlags to add as "-D${attr}=${value}"
   extraCmakeFlags ? { },
@@ -75,9 +74,6 @@ stdenv.mkDerivation (finalAttrs: {
   ]
   ++ lib.optionals packages.PYTHON [
     python3
-  ]
-  ++ lib.optionals packages.MPIIO [
-    mpich
   ];
 
   passthru = {