diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 3cf33494a5ae..fd4812329570 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -186,7 +186,7 @@ static void unmap_cpu_from_node(unsigned long cpu)
 	dbg("removing cpu %lu from node %d\n", cpu, node);
 
 	if (cpumask_test_cpu(cpu, node_to_cpumask_map[node])) {
-		cpumask_set_cpu(cpu, node_to_cpumask_map[node]);
+		cpumask_clear_cpu(cpu, node_to_cpumask_map[node]);
 	} else {
 		printk(KERN_ERR "WARNING: cpu %lu not found in node %d\n",
 		       cpu, node);