diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c
index d451b4f5b1e0..e121b555fdb4 100644
--- a/arch/xtensa/kernel/pci.c
+++ b/arch/xtensa/kernel/pci.c
@@ -41,8 +41,8 @@
  * pci_bus_add_device
  */
 
-struct pci_controller* pci_ctrl_head;
-struct pci_controller** pci_ctrl_tail = &pci_ctrl_head;
+static struct pci_controller *pci_ctrl_head;
+static struct pci_controller **pci_ctrl_tail = &pci_ctrl_head;
 
 static int pci_bus_count;