diff --git a/mlua-sys/src/lua55/lua.rs b/mlua-sys/src/lua55/lua.rs
index 8f55152..60bd4ec 100644
--- a/mlua-sys/src/lua55/lua.rs
+++ b/mlua-sys/src/lua55/lua.rs
@@ -13,7 +13,7 @@ pub const LUA_MULTRET: c_int = -1;
 
 // Size of the Lua stack
 #[doc(hidden)]
-pub const LUAI_MAXSTACK: c_int = libc::INT_MAX;
+pub const LUAI_MAXSTACK: c_int = c_int::MAX;
 
 // Size of a raw memory area associated with  a Lua state with very fast access.
 pub const LUA_EXTRASPACE: usize = mem::size_of::<*const ()>();
@@ -21,7 +21,7 @@ pub const LUA_EXTRASPACE: usize = mem::size_of::<*const ()>();
 //
 // Pseudo-indices
 //
-pub const LUA_REGISTRYINDEX: c_int = -(libc::INT_MAX / 2 + 1000);
+pub const LUA_REGISTRYINDEX: c_int = -(c_int::MAX / 2 + 1000);
 
 pub const fn lua_upvalueindex(i: c_int) -> c_int {
     LUA_REGISTRYINDEX - i
diff --git a/tests/module/Cargo.toml b/tests/module/Cargo.toml
index c2e0da8..9cf8768 100644
--- a/tests/module/Cargo.toml
+++ b/tests/module/Cargo.toml
@@ -13,6 +13,7 @@ members = [
 ]
 
 [features]
+lua55 = ["mlua/lua55"]
 lua54 = ["mlua/lua54"]
 lua53 = ["mlua/lua53"]
 lua52 = ["mlua/lua52"]
diff --git a/tests/module/loader/Cargo.toml b/tests/module/loader/Cargo.toml
index b51f002..ddd6123 100644
--- a/tests/module/loader/Cargo.toml
+++ b/tests/module/loader/Cargo.toml
@@ -5,6 +5,7 @@ authors = ["Aleksandr Orlenko <zxteam@pm.me>"]
 edition = "2021"
 
 [features]
+lua55 = ["mlua/lua55"]
 lua54 = ["mlua/lua54"]
 lua53 = ["mlua/lua53"]
 lua52 = ["mlua/lua52"]
diff --git a/tests/serde.rs b/tests/serde.rs
index 2f07d7f..d3cc00e 100644
--- a/tests/serde.rs
+++ b/tests/serde.rs
@@ -36,7 +36,7 @@ fn test_serialize() -> Result<(), Box<dyn StdError>> {
             _integer = 123,
             _number = 321.99,
             _string = "test string serialization",
-            _table_arr = {nil, "value 1", nil, "value 2", {}},
+            _table_arr = {null, "value 1", 2, "value 3", {}},
             _table_map = {["table"] = "map", ["null"] = null},
             _bytes = "\240\040\140\040",
             _userdata = ud,
@@ -53,7 +53,7 @@ fn test_serialize() -> Result<(), Box<dyn StdError>> {
         "_integer": 123,
         "_number": 321.99,
         "_string": "test string serialization",
-        "_table_arr": [null, "value 1", null, "value 2", {}],
+        "_table_arr": [null, "value 1", 2, "value 3", {}],
         "_table_map": {"table": "map", "null": null},
         "_bytes": [240, 40, 140, 40],
         "_userdata": [123, "test userdata"],
@@ -184,7 +184,7 @@ fn test_serialize_sorted() -> LuaResult<()> {
             _integer = 123,
             _number = 321.99,
             _string = "test string serialization",
-            _table_arr = {nil, "value 1", nil, "value 2", {}},
+            _table_arr = {null, "value 1", 2, "value 3", {}},
             _table_map = {["table"] = "map", ["null"] = null},
             _bytes = "\240\040\140\040",
             _null = null,
@@ -198,7 +198,7 @@ fn test_serialize_sorted() -> LuaResult<()> {
     let json = serde_json::to_string(&value.to_serializable().sort_keys(true)).unwrap();
     assert_eq!(
         json,
-        r#"{"_bool":true,"_bytes":[240,40,140,40],"_empty_array":[],"_empty_map":{},"_integer":123,"_null":null,"_number":321.99,"_string":"test string serialization","_table_arr":[null,"value 1",null,"value 2",{}],"_table_map":{"null":null,"table":"map"}}"#
+        r#"{"_bool":true,"_bytes":[240,40,140,40],"_empty_array":[],"_empty_map":{},"_integer":123,"_null":null,"_number":321.99,"_string":"test string serialization","_table_arr":[null,"value 1",2,"value 3",{}],"_table_map":{"null":null,"table":"map"}}"#
     );
 
     Ok(())