diff --git a/drivers/io/io_fip.c b/drivers/io/io_fip.c
index a23940d..487f586 100644
--- a/drivers/io/io_fip.c
+++ b/drivers/io/io_fip.c
@@ -69,7 +69,7 @@
 
 
 /* Identify the device type as a virtual driver */
-io_type_t device_type_fip(void)
+static io_type_t device_type_fip(void)
 {
 	return IO_TYPE_FIRMWARE_IMAGE_PACKAGE;
 }