diff --git a/test_regress/t/t_cover_expr_fork.py b/test_regress/t/t_cover_expr_fork.py
index 8b6c049d2..57b6e30b1 100755
--- a/test_regress/t/t_cover_expr_fork.py
+++ b/test_regress/t/t_cover_expr_fork.py
@@ -13,6 +13,6 @@ test.scenarios('simulator')
 
 test.compile(verilator_flags2=['--coverage-expr --binary'])
 
-test.execute()
+test.execute(all_run_flags=[" +verilator+coverage+file+" + test.obj_dir + "/coverage.dat"])
 
 test.passes()