diff --git a/xen/arch/x86/cpu/mcheck/mce.c b/xen/arch/x86/cpu/mcheck/mce.c
index 9028ccde54..84238cd0ef 100644
--- a/xen/arch/x86/cpu/mcheck/mce.c
+++ b/xen/arch/x86/cpu/mcheck/mce.c
@@ -663,7 +663,7 @@ static int mca_cap_init(void)
         if ( !all )
             return -ENOMEM;
         for ( i = 0; i < nr; i++ )
-            mcabanks_set(i, mca_allbanks);
+            mcabanks_set(i, all);
         mcabanks_free(xchg(&mca_allbanks, all));
     }