diff --git a/reg-tests/compression/lua_validation.vtc b/reg-tests/compression/lua_validation.vtc
index 817820ae1..c14d5ca07 100644
--- a/reg-tests/compression/lua_validation.vtc
+++ b/reg-tests/compression/lua_validation.vtc
@@ -8,6 +8,7 @@ feature ignore_unknown_macro
 
 haproxy h1 -conf {
 global
+	tune.lua.smp-preserve-bool on
 	lua-load		${testdir}/lua_validation.lua
 
 defaults
diff --git a/reg-tests/lua/bad_http_clt_req_duration.vtc b/reg-tests/lua/bad_http_clt_req_duration.vtc
index 5cfdf1a7e..b5d56fff8 100644
--- a/reg-tests/lua/bad_http_clt_req_duration.vtc
+++ b/reg-tests/lua/bad_http_clt_req_duration.vtc
@@ -35,6 +35,7 @@ syslog Slog {
 
 haproxy h1 -conf {
     global
+        tune.lua.smp-preserve-bool on
         lua-load ${testdir}/bad_http_clt_req_duration.lua
 
     defaults
diff --git a/reg-tests/lua/close_wait_lf.vtc b/reg-tests/lua/close_wait_lf.vtc
index 7bed3fd8e..db1a3a9bb 100644
--- a/reg-tests/lua/close_wait_lf.vtc
+++ b/reg-tests/lua/close_wait_lf.vtc
@@ -30,6 +30,7 @@ haproxy h1 -conf {
         timeout connect "${HAPROXY_TEST_TIMEOUT-5s}"
 
     global
+        tune.lua.smp-preserve-bool on
         lua-load ${testdir}/close_wait_lf.lua
 
     frontend frt
diff --git a/reg-tests/lua/h_txn_get_priv.vtc b/reg-tests/lua/h_txn_get_priv.vtc
index 0a846af59..e6016259c 100644
--- a/reg-tests/lua/h_txn_get_priv.vtc
+++ b/reg-tests/lua/h_txn_get_priv.vtc
@@ -5,6 +5,7 @@ feature ignore_unknown_macro
 
 haproxy h1 -conf {
     global
+        tune.lua.smp-preserve-bool on
         lua-load ${testdir}/h_txn_get_priv.lua
 
     defaults
diff --git a/reg-tests/lua/httpclient_action.vtc b/reg-tests/lua/httpclient_action.vtc
index 11c7d629b..05a5d4aee 100644
--- a/reg-tests/lua/httpclient_action.vtc
+++ b/reg-tests/lua/httpclient_action.vtc
@@ -12,6 +12,7 @@ feature ignore_unknown_macro
 haproxy h1 -conf {
 
     global
+        tune.lua.smp-preserve-bool on
         lua-load ${testdir}/httpclient_action.lua
     defaults
         mode                    tcp
diff --git a/reg-tests/lua/lua_httpclient.vtc b/reg-tests/lua/lua_httpclient.vtc
index bf53b5281..5ca695305 100644
--- a/reg-tests/lua/lua_httpclient.vtc
+++ b/reg-tests/lua/lua_httpclient.vtc
@@ -38,6 +38,7 @@ server s3 {
 
 haproxy h1 -conf {
     global
+        tune.lua.smp-preserve-bool on
         lua-load ${testdir}/lua_httpclient.lua
 
     defaults
diff --git a/reg-tests/lua/lua_socket.vtc b/reg-tests/lua/lua_socket.vtc
index 3d0cd1572..ba8eed093 100644
--- a/reg-tests/lua/lua_socket.vtc
+++ b/reg-tests/lua/lua_socket.vtc
@@ -10,6 +10,7 @@ server s1 {
 
 haproxy h1 -conf {
     global
+        tune.lua.smp-preserve-bool on
         lua-load ${testdir}/lua_socket.lua
 
     defaults
diff --git a/reg-tests/lua/set_var.vtc b/reg-tests/lua/set_var.vtc
index 51b5dfc51..95a854a14 100644
--- a/reg-tests/lua/set_var.vtc
+++ b/reg-tests/lua/set_var.vtc
@@ -11,6 +11,7 @@ haproxy h1 -conf {
         tune.idle-pool.shared off
 
     global
+        tune.lua.smp-preserve-bool on
         lua-load ${testdir}/set_var.lua
 
     defaults
diff --git a/reg-tests/lua/txn_get_priv-thread.vtc b/reg-tests/lua/txn_get_priv-thread.vtc
index 3cf79bdfb..c4af594fc 100644
--- a/reg-tests/lua/txn_get_priv-thread.vtc
+++ b/reg-tests/lua/txn_get_priv-thread.vtc
@@ -12,6 +12,8 @@ haproxy h1 -conf {
         # under us.
         tune.idle-pool.shared off
 
+        tune.lua.smp-preserve-bool on
+
         lua-load-per-thread ${testdir}/txn_get_priv.lua
         lua-load-per-thread ${testdir}/txn_get_priv-print_r.lua
 
diff --git a/reg-tests/lua/txn_get_priv.vtc b/reg-tests/lua/txn_get_priv.vtc
index e370d098f..f107e7fd5 100644
--- a/reg-tests/lua/txn_get_priv.vtc
+++ b/reg-tests/lua/txn_get_priv.vtc
@@ -6,6 +6,7 @@ feature ignore_unknown_macro
 
 haproxy h1 -conf {
     global
+        tune.lua.smp-preserve-bool on
         lua-load ${testdir}/txn_get_priv.lua
         lua-load ${testdir}/txn_get_priv-print_r.lua
 
diff --git a/reg-tests/lua/wrong_types_usage.vtc b/reg-tests/lua/wrong_types_usage.vtc
index 995d42624..c28d45ef9 100644
--- a/reg-tests/lua/wrong_types_usage.vtc
+++ b/reg-tests/lua/wrong_types_usage.vtc
@@ -43,6 +43,7 @@ server s1 -repeat 2 {
 
 haproxy h1 -conf {
     global
+        tune.lua.smp-preserve-bool on
         lua-load ${testdir}/wrong_types_usage.lua
 
     defaults
diff --git a/reg-tests/mailers/healthcheckmail.vtc b/reg-tests/mailers/healthcheckmail.vtc
index 208d350f6..20f4ccb6c 100644
--- a/reg-tests/mailers/healthcheckmail.vtc
+++ b/reg-tests/mailers/healthcheckmail.vtc
@@ -12,6 +12,7 @@ syslog S1 -level notice {
 
 haproxy h1 -conf {
     global
+        tune.lua.smp-preserve-bool on
         lua-load ${testdir}/mailers.lua
         lua-load ${testdir}/healthcheckmail.lua