diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 96de97a460791ae70efa8f6b0ff91e736363c5e9..bf5ec0c8f95e0924910386764e1ceae7df41c487 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -103,7 +103,7 @@ struct flush_queue {
 	struct flush_queue_entry *entries;
 };
 
-DEFINE_PER_CPU(struct flush_queue, flush_queue);
+static DEFINE_PER_CPU(struct flush_queue, flush_queue);
 
 static atomic_t queue_timer_on;
 static struct timer_list queue_timer;