diff --git a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
index c9ee85037644..f0387486eb17 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
@@ -1198,7 +1198,7 @@ static int gmin_get_config_dsm_var(struct device *dev,
 	dev_info(dev, "found _DSM entry for '%s': %s\n", var,
 		 cur->string.pointer);
 	strscpy(out, cur->string.pointer, *out_len);
-	*out_len = strlen(cur->string.pointer);
+	*out_len = strlen(out);
 
 	ACPI_FREE(obj);
 	return 0;