diff --git a/docs/source/usersguide/install.rst b/docs/source/usersguide/install.rst
index d5b1c7e41e..dcf55948cc 100644
--- a/docs/source/usersguide/install.rst
+++ b/docs/source/usersguide/install.rst
@@ -252,7 +252,7 @@ Prerequisites
       In addition to turning this option on, the path to the DAGMC installation
       should be specified as part of the ``CMAKE_PREFIX_PATH`` variable::
 
-          cmake -Ddagmc=on -DCMAKE_PREFIX_PATH=/path/to/dagmc/installation
+          cmake -DOPENMC_USE_DAGMC=on -DCMAKE_PREFIX_PATH=/path/to/dagmc/installation
 
     * libMesh_ mesh library framework for numerical simulations of partial differential equations
 
@@ -263,7 +263,7 @@ Prerequisites
       installation should be specified as part of the ``CMAKE_PREFIX_PATH``
       variable.::
 
-          CXX=mpicxx cmake -Dlibmesh=on -DCMAKE_PREFIX_PATH=/path/to/libmesh/installation
+          CXX=mpicxx cmake -DOPENMC_USE_LIBMESH=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.