diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index d97ce22267fb..7e55aa9ce680 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -138,7 +138,7 @@ static int check_acpi_tpm2(struct device *dev)
 #define LPC_CNTRL_REG_OFFSET            0x84
 #define LPC_CLKRUN_EN                   (1 << 2)
 
-void __iomem *ilb_base_addr;
+static void __iomem *ilb_base_addr;
 
 static inline bool is_bsw(void)
 {