diff --git a/eb_hooks.py b/eb_hooks.py
index cb1ddbc8..7168ea71 100644
--- a/eb_hooks.py
+++ b/eb_hooks.py
@@ -1709,6 +1709,7 @@ def set_maximum(parallel, max_value):
     },
     'MBX': {
         '*': (divide_by_factor, 2),
+        CPU_TARGET_A64FX: (set_maximum, 1),
     },
     'QuantumESPRESSO': {
         CPU_TARGET_A64FX: (set_maximum, 6),