diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index f2c621b55f497..9908d233305e4 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -828,7 +828,7 @@ static const struct pci_device_id pmc_pci_ids[] = {
  * the platform BIOS enforces 24Mhx Crystal to shutdown
  * before PMC can assert SLP_S0#.
  */
-int quirk_xtal_ignore(const struct dmi_system_id *id)
+static int quirk_xtal_ignore(const struct dmi_system_id *id)
 {
 	struct pmc_dev *pmcdev = &pmc;
 	u32 value;