diff --git a/drivers/block/ahci.c b/drivers/block/ahci.c
index f4d1d81..f088063 100644
--- a/drivers/block/ahci.c
+++ b/drivers/block/ahci.c
@@ -643,6 +643,7 @@
 	if (ahci_device_data_io(port, (u8 *) &fis, sizeof(fis), tmpid,
 				sizeof(hd_driveid_t), 0)) {
 		debug("scsi_ahci: SCSI inquiry command failure.\n");
+		free(tmpid);
 		return -EIO;
 	}