diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
index 2d73dfcecdbb4e2098e3d881a6a091a9e8ca5e62..57313f4658bc55a00a5a7d36fbb86450f8144def 100644
--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -180,7 +180,7 @@ struct pnp_protocol pnpacpi_protocol = {
 };
 EXPORT_SYMBOL(pnpacpi_protocol);
 
-static char *pnpacpi_get_id(struct acpi_device *device)
+static char *__init pnpacpi_get_id(struct acpi_device *device)
 {
 	struct acpi_hardware_id *id;