diff --git a/src/scripting/lua_api.hpp b/src/scripting/lua_api.hpp
index 20d88efcf00..30274fa7b63 100644
--- a/src/scripting/lua_api.hpp
+++ b/src/scripting/lua_api.hpp
@@ -120,11 +120,6 @@ bool luaW_pcall(lua_State *L, int nArgs, int nRets, bool allow_wml_error = false
  */
 bool luaW_getglobal(lua_State *L, ...);
 
-/**
- * Converts a Lua value to a unit pointer.
- */
-unit *luaW_tounit(lua_State *L, int index, bool only_on_map);
-
 /**
  * Converts a Lua value to a unit pointer.
  */