diff --git a/ci/hermes/packages/hermes/package.py b/ci/hermes/packages/hermes/package.py
index a21ec63b6..983bf3bdb 100644
--- a/ci/hermes/packages/hermes/package.py
+++ b/ci/hermes/packages/hermes/package.py
@@ -47,7 +47,7 @@ class Hermes(CMakePackage):
     depends_on('libaio')
     depends_on('doxygen')  # @1.9.3
     depends_on('boost@1.7: +context +fiber +filesystem +system +atomic +chrono +serialization +signals +pic +regex')
-    depends_on('libfabric fabrics=sockets,tcp,udp,verbs',
+    depends_on('libfabric fabrics=sockets,tcp,udp,verbs,mlx',
                when='+ares')
     depends_on('libfabric fabrics=verbs',
                when='+only_verbs')
diff --git a/ci/hermes/packages/hermes_shm/package.py b/ci/hermes/packages/hermes_shm/package.py
index 1749fb515..73ed89a2a 100644
--- a/ci/hermes/packages/hermes_shm/package.py
+++ b/ci/hermes/packages/hermes_shm/package.py
@@ -26,7 +26,7 @@ class HermesShm(CMakePackage):
     depends_on('libaio')
     depends_on('doxygen')  # @1.9.3
     depends_on('boost@1.7: +context +fiber +filesystem +system +atomic +chrono +serialization +signals +pic +regex')
-    depends_on('libfabric fabrics=sockets,tcp,udp,verbs',
+    depends_on('libfabric fabrics=sockets,tcp,udp,verbs,mlx',
                when='+ares')
     depends_on('libfabric fabrics=verbs',
                when='+only_verbs')