diff --git a/fenics/Dockerfile b/fenics/Dockerfile
index 92a72dc..59b1158 100644
--- a/fenics/Dockerfile
+++ b/fenics/Dockerfile
@@ -34,7 +34,7 @@ ARG PETSC_SLEPC_OPTFLAGS="-O2"
 # Turn on PETSc and SLEPc debugging. "yes" or "no".
 ARG PETSC_SLEPC_DEBUGGING="no"
 # MPI variant. "mpich" or "openmpi".
-ARG MPI="mpich"
+ARG MPI="openmpi"
 ARG PETSC_VERSION
 ARG SLEPC_VERSION
 ARG PYBIND11_VERSION