diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 20f423337e1f..ebc3ad0a188d 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -26,11 +26,6 @@
 acpi_status acpi_os_initialize1(void);
 int init_acpi_device_notify(void);
 int acpi_scan_init(void);
-#ifdef	CONFIG_ACPI_PCI_SLOT
-void acpi_pci_slot_init(void);
-#else
-static inline void acpi_pci_slot_init(void) { }
-#endif
 void acpi_pci_root_init(void);
 void acpi_pci_link_init(void);
 void acpi_pci_root_hp_init(void);