diff --git a/eb_hooks.py b/eb_hooks.py
index 0514bb18..11a1ac17 100644
--- a/eb_hooks.py
+++ b/eb_hooks.py
@@ -2131,7 +2131,7 @@ def set_maximum(parallel, max_value):
     # software-specific limits
     'libxc': {
         '*': (divide_by_factor, 2),
-        CPU_TARGET_A64FX: (set_maximum, 12),
+        CPU_TARGET_A64FX: (set_maximum, 6),
     },
     'LLVM': {
         '*': (divide_by_factor, 2),