diff --git a/polaris/machines/frontier.cfg b/polaris/machines/frontier.cfg
index 46992c22b..df811bc4d 100644
--- a/polaris/machines/frontier.cfg
+++ b/polaris/machines/frontier.cfg
@@ -30,6 +30,12 @@ mpi_crayclang = mpich
 # the system MPI library to use for crayclanggpu compiler
 mpi_crayclanggpu = mpich
 
+# the system MPI library to use for amdclang compiler
+mpi_amdclang = mpich
+
+# the system MPI library to use for amdclanggpu compiler
+mpi_amdclanggpu = mpich
+
 # the base path for spack environments used by polaris
 spack = /ccs/proj/cli115/software/polaris/frontier/spack