diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 218b693..0d93586 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -51,7 +51,7 @@
  *   share_irqs - whether we pass SA_SHIRQ to request_irq().  This option
  *                is unsafe when used on edge-triggered interrupts.
  */
-unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
+static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
 
 /*
  * Debugging.