diff --git a/drivers/tpm/tpm2_tis_sandbox.c b/drivers/tpm/tpm2_tis_sandbox.c
index dd94bdc31f..e4004cfcca 100644
--- a/drivers/tpm/tpm2_tis_sandbox.c
+++ b/drivers/tpm/tpm2_tis_sandbox.c
@@ -810,7 +810,7 @@ static int sandbox_tpm2_open(struct udevice *dev)
 	struct sandbox_tpm2 *tpm = dev_get_priv(dev);
 
 	if (tpm->init_done)
-		return -EIO;
+		return -EBUSY;
 
 	tpm->init_done = true;