diff --git a/docs/source/usersguide/install.rst b/docs/source/usersguide/install.rst
index 53c06ab0ad..1cb00ae559 100644
--- a/docs/source/usersguide/install.rst
+++ b/docs/source/usersguide/install.rst
@@ -203,7 +203,7 @@ Prerequisites
       respectively. To link against a parallel HDF5 library, make sure to set
       the HDF5_PREFER_PARALLEL CMake option, e.g.::
 
-          CXX=mpicxx.mpich cmake -DHDF5_PREFER_PARALLEL=on ..
+          cmake -DHDF5_PREFER_PARALLEL=on -DOPENMC_USE_MPI=on ..
 
       Note that the exact package names may vary depending on your particular
       distribution and version.
@@ -263,7 +263,7 @@ Prerequisites
       installation should be specified as part of the ``CMAKE_PREFIX_PATH``
       variable.::
 
-          CXX=mpicxx cmake -DOPENMC_USE_LIBMESH=on -DCMAKE_PREFIX_PATH=/path/to/libmesh/installation
+          cmake -DOPENMC_USE_LIBMESH=on -DOPENMC_USE_MPI=on -DCMAKE_PREFIX_PATH=/path/to/libmesh/installation
 
       Note that libMesh is most commonly compiled with MPI support. If that
       is the case, then OpenMC should be compiled with MPI support as well.