diff --git a/var/spack/repos/builtin/packages/openmpi/package.py b/var/spack/repos/builtin/packages/openmpi/package.py
index 2f14b2ad23..9dac13eb99 100644
--- a/var/spack/repos/builtin/packages/openmpi/package.py
+++ b/var/spack/repos/builtin/packages/openmpi/package.py
@@ -41,7 +41,7 @@ class Openmpi(AutotoolsPackage):
     # Still supported
     version('4.1.0', sha256='73866fb77090819b6a8c85cb8539638d37d6877455825b74e289d647a39fd5b5')  # libmpi.so.40.30.0
     version('4.0.6', sha256='94b7b59ae9860f3bd7b5f378a698713e7b957070fdff2c43453b6cbf8edb410c')  # libmpi.so.40.20.6
-    version('4.0.5', preferred=True, sha256='c58f3863b61d944231077f344fe6b4b8fbb83f3d1bc93ab74640bf3e5acac009')  # libmpi.so.40.20.5
+    version('4.0.5', sha256='c58f3863b61d944231077f344fe6b4b8fbb83f3d1bc93ab74640bf3e5acac009')  # libmpi.so.40.20.5
     version('4.0.4', sha256='47e24eb2223fe5d24438658958a313b6b7a55bb281563542e1afc9dec4a31ac4')  # libmpi.so.40.20.4
     version('4.0.3', sha256='1402feced8c3847b3ab8252165b90f7d1fa28c23b6b2ca4632b6e4971267fd03')  # libmpi.so.40.20.3
     version('4.0.2', sha256='900bf751be72eccf06de9d186f7b1c4b5c2fa9fa66458e53b77778dffdfe4057')  # libmpi.so.40.20.2