diff --git a/test_regress/t/t_prot_lib.pl b/test_regress/t/t_prot_lib.pl
index 7f2b9b352..22fb1c6d1 100755
--- a/test_regress/t/t_prot_lib.pl
+++ b/test_regress/t/t_prot_lib.pl
@@ -35,6 +35,8 @@ while (1) {
                 $secret_dir,
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_secret.v"],
         verilator_run => 1,
         );
diff --git a/test_regress/t/t_prot_lib_clk_gated.pl b/test_regress/t/t_prot_lib_clk_gated.pl
index 8bb14ba16..0f7fcd125 100755
--- a/test_regress/t/t_prot_lib_clk_gated.pl
+++ b/test_regress/t/t_prot_lib_clk_gated.pl
@@ -37,6 +37,8 @@ while (1) {
                 "-GGATED_CLK=1",
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_secret.v"],
         verilator_run => 1,
         );
diff --git a/test_regress/t/t_prot_lib_comb.pl b/test_regress/t/t_prot_lib_comb.pl
index 296873c8f..856e3ebd0 100755
--- a/test_regress/t/t_prot_lib_comb.pl
+++ b/test_regress/t/t_prot_lib_comb.pl
@@ -35,6 +35,8 @@ while (1) {
                 $secret_dir,
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_comb.v"],
         verilator_run => 1,
         );
diff --git a/test_regress/t/t_prot_lib_inout_bad.pl b/test_regress/t/t_prot_lib_inout_bad.pl
index 955f6793e..d3c7f81d2 100755
--- a/test_regress/t/t_prot_lib_inout_bad.pl
+++ b/test_regress/t/t_prot_lib_inout_bad.pl
@@ -12,7 +12,10 @@ scenarios(vlt => 1);
 
 compile (
     verilator_flags2 => ["--protect-lib",
-                         "secret"],
+                         "secret",
+                         "--protect-key",
+                         "secret-key"
+                       ],
     verilator_make_gcc => 0,
     fails => 1,
     expect_filename => $Self->{golden_filename},
diff --git a/test_regress/t/t_prot_lib_shared.pl b/test_regress/t/t_prot_lib_shared.pl
index a595a4866..91e2e5cc6 100755
--- a/test_regress/t/t_prot_lib_shared.pl
+++ b/test_regress/t/t_prot_lib_shared.pl
@@ -39,6 +39,8 @@ while (1) {
                 $secret_dir,
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_secret.v"],
         verilator_run => 1,
         );