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-rw-r--r--src/ffi/lua.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/ffi/lua.rs b/src/ffi/lua.rs
index a48be1a..41ef9c6 100644
--- a/src/ffi/lua.rs
+++ b/src/ffi/lua.rs
@@ -64,7 +64,7 @@ pub use super::compat53::lua_getglobal;
#[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
#[inline(always)]
-pub fn lua_upvalueindex(i: c_int) -> c_int {
+pub const fn lua_upvalueindex(i: c_int) -> c_int {
LUA_REGISTRYINDEX - i
}