diff --git a/var/spack/repos/builtin/packages/libfabric/package.py b/var/spack/repos/builtin/packages/libfabric/package.py
index c6047d053a8..87eaf6c50bd 100644
--- a/var/spack/repos/builtin/packages/libfabric/package.py
+++ b/var/spack/repos/builtin/packages/libfabric/package.py
@@ -36,7 +36,8 @@ class Libfabric(AutotoolsPackage):
                'udp',
                'rxm',
                'rxd',
-               'mlx')
+               'mlx',
+               'tcp')
 
     variant(
        'fabrics',