diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index f0139d1e8b63..14838b21ec6a 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -1433,8 +1433,7 @@ static void of_unittest_destroy_tracked_overlays(void)
 	} while (defers > 0);
 }
 
-static int __init of_unittest_apply_overlay(int overlay_nr, int unittest_nr,
-		int *overlay_id)
+static int __init of_unittest_apply_overlay(int overlay_nr, int *overlay_id)
 {
 	const char *overlay_name;
 
@@ -1467,7 +1466,7 @@ static int __init of_unittest_apply_overlay_check(int overlay_nr,
 	}
 
 	ovcs_id = 0;
-	ret = of_unittest_apply_overlay(overlay_nr, unittest_nr, &ovcs_id);
+	ret = of_unittest_apply_overlay(overlay_nr, &ovcs_id);
 	if (ret != 0) {
 		/* of_unittest_apply_overlay already called unittest() */
 		return ret;
@@ -1503,7 +1502,7 @@ static int __init of_unittest_apply_revert_overlay_check(int overlay_nr,
 
 	/* apply the overlay */
 	ovcs_id = 0;
-	ret = of_unittest_apply_overlay(overlay_nr, unittest_nr, &ovcs_id);
+	ret = of_unittest_apply_overlay(overlay_nr, &ovcs_id);
 	if (ret != 0) {
 		/* of_unittest_apply_overlay already called unittest() */
 		return ret;