diff --git a/server/gameserver/lispenv.cc b/server/gameserver/lispenv.cc
index 93c4f24b..0073632b 100644
--- a/server/gameserver/lispenv.cc
+++ b/server/gameserver/lispenv.cc
@@ -11,3 +11,15 @@ void LispEnv::UnInit()
 {
 
 }
+
+std::shared_ptr<a8::lisp::Value> LispEnv::CompileSkillNumberExpr(const std::string& script)
+{
+
+}
+
+float LispEnv::EvalSkillNumberExpr(std::shared_ptr<a8::lisp::Value> expr,
+                                   Creature* c,
+                                   const mt::Skill* skill_meta)
+{
+
+}
diff --git a/server/gameserver/lispenv.h b/server/gameserver/lispenv.h
index 93e61d0b..ac518837 100644
--- a/server/gameserver/lispenv.h
+++ b/server/gameserver/lispenv.h
@@ -3,6 +3,7 @@
 #include <a8/singleton.h>
 #include <a8/lisp.h>
 
+class Creature;
 class LispEnv : public a8::Singleton<LispEnv>
 {
 
@@ -15,7 +16,10 @@ class LispEnv : public a8::Singleton<LispEnv>
     void Init();
     void UnInit();
 
-    std::shared_ptr<a8::lisp::GlobalScope> GetSkillEnv() { return skill_env_; };
+    std::shared_ptr<a8::lisp::Value> CompileSkillNumberExpr(const std::string& script);
+    float EvalSkillNumberExpr(std::shared_ptr<a8::lisp::Value> expr,
+                              Creature* c,
+                              const mt::Skill* skill_meta);
 
  private: