diff --git a/Testing/unit/hg/CMakeLists.txt b/Testing/unit/hg/CMakeLists.txt
index 78c250ae..be3a0ecf 100644
--- a/Testing/unit/hg/CMakeLists.txt
+++ b/Testing/unit/hg/CMakeLists.txt
@@ -163,7 +163,7 @@ function(add_mercury_test_comm_all test_name)
     if(NOT ((${comm} STREQUAL "bmi") OR (${comm} STREQUAL "mpi")))
       add_mercury_test_comm(${test_name} ${comm}
         "${NA_${upper_comm}_TESTING_PROTOCOL}"
-        "${NA_TESTING_NO_BLOCK}" ${MERCURY_TESTING_ENABLE_PARALLEL} true false)
+        "${NA_TESTING_NO_BLOCK}" false true false)
     endif()
     # Scalable test
     if(NOT APPLE)