diff --git a/binding-sandbox/binding-base.cpp b/binding-sandbox/binding-base.cpp
index babb67a4..ea391dd4 100644
--- a/binding-sandbox/binding-base.cpp
+++ b/binding-sandbox/binding-base.cpp
@@ -40,7 +40,7 @@ binding_base::stack_frame::~stack_frame() {
     }
 }
 
-binding_base::binding_base(std::shared_ptr<struct w2c_ruby> m) : next_func_ptr(-1), _instance(m) {}
+binding_base::binding_base(std::shared_ptr<struct w2c_ruby> m) : _instance(m) {}
 
 binding_base::~binding_base() {
     // Destroy all stack frames in order from top to bottom to enforce a portable, compiler-independent ordering of stack frame destruction
diff --git a/binding-sandbox/binding-base.h b/binding-sandbox/binding-base.h
index e0d37c12..04884d67 100644
--- a/binding-sandbox/binding-base.h
+++ b/binding-sandbox/binding-base.h
@@ -221,7 +221,6 @@ namespace mkxp_sandbox {
 
         std::shared_ptr<struct w2c_ruby> _instance;
         std::unordered_map<key_t, struct fiber, boost::hash<key_t>> fibers;
-        wasm_ptr_t next_func_ptr;
         wasm_ptr_t stack_ptr;
 
     public: