diff --git a/src/add-ons/kernel/drivers/audio/hda/driver.c b/src/add-ons/kernel/drivers/audio/hda/driver.c
index ee0d74088e..a46d32d0e6 100644
--- a/src/add-ons/kernel/drivers/audio/hda/driver.c
+++ b/src/add-ons/kernel/drivers/audio/hda/driver.c
@@ -3,6 +3,8 @@
 hda_controller cards[MAXCARDS];
 uint32 num_cards;
 
+int32 api_version = B_CUR_DRIVER_API_VERSION;
+
 pci_module_info* pci;
 
 const char** publish_devices(void); /* Just to silence compiler */