diff --git a/mrbgems/mruby-binding-core/src/binding-core.c b/mrbgems/mruby-binding-core/src/binding-core.c
index 7c3d81adc..a15cf1254 100644
--- a/mrbgems/mruby-binding-core/src/binding-core.c
+++ b/mrbgems/mruby-binding-core/src/binding-core.c
@@ -359,35 +359,35 @@ binding_source_location(mrb_state *mrb, mrb_value self)
 }
 
 mrb_value
-mrb_binding_alloc(mrb_state *mrb)
+mrb_binding_new(mrb_state *mrb, const struct RProc *proc, mrb_value recv, struct REnv *env)
 {
-  struct RObject *obj = MRB_OBJ_ALLOC(mrb, MRB_TT_OBJECT, mrb_class_get_id(mrb, MRB_SYM(Binding)));
-  return mrb_obj_value(obj);
+  struct RObject *binding = MRB_OBJ_ALLOC(mrb, MRB_TT_OBJECT, mrb_class_get_id(mrb, MRB_SYM(Binding)));
+
+  if (proc && !MRB_PROC_CFUNC_P(proc)) {
+    const mrb_irep *irep = proc->body.irep;
+    mrb_obj_iv_set(mrb, binding, MRB_SYM(pc), mrb_fixnum_value(mrb->c->ci[-1].pc - irep->iseq - 1 /* step back */));
+  }
+  proc = mrb_binding_wrap_lvspace(mrb, proc, &env);
+
+  mrb_obj_iv_set(mrb, binding, MRB_SYM(proc), mrb_obj_value((void*)proc));
+  mrb_obj_iv_set(mrb, binding, MRB_SYM(recv), recv);
+  mrb_obj_iv_set(mrb, binding, MRB_SYM(env), mrb_obj_value(env));
+
+  return mrb_obj_value(binding);
 }
 
 static mrb_value
 mrb_f_binding(mrb_state *mrb, mrb_value self)
 {
-  mrb_value binding;
   struct RProc *proc;
   struct REnv *env;
 
-  binding = mrb_binding_alloc(mrb);
   proc = (struct RProc*)mrb_proc_get_caller(mrb, &env);
   if (!env || MRB_PROC_CFUNC_P(proc)) {
     proc = NULL;
     env = NULL;
   }
-
-  if (proc && !MRB_PROC_CFUNC_P(proc)) {
-    const mrb_irep *irep = proc->body.irep;
-    mrb_iv_set(mrb, binding, MRB_SYM(pc), mrb_fixnum_value(mrb->c->ci[-1].pc - irep->iseq - 1 /* step back */));
-  }
-  proc = mrb_binding_wrap_lvspace(mrb, proc, &env);
-  mrb_iv_set(mrb, binding, MRB_SYM(proc), mrb_obj_value(proc));
-  mrb_iv_set(mrb, binding, MRB_SYM(recv), self);
-  mrb_iv_set(mrb, binding, MRB_SYM(env), mrb_obj_value(env));
-  return binding;
+  return mrb_binding_new(mrb, proc, self, env);
 }
 
 void
diff --git a/mrbgems/mruby-proc-binding/src/proc-binding.c b/mrbgems/mruby-proc-binding/src/proc-binding.c
index b95edbc1b..0641617ac 100644
--- a/mrbgems/mruby-proc-binding/src/proc-binding.c
+++ b/mrbgems/mruby-proc-binding/src/proc-binding.c
@@ -7,13 +7,11 @@
 mrb_value mrb_proc_source_location(mrb_state *mrb, struct RProc *p);
 
 /* provided by mruby-binding-core */
-mrb_value mrb_binding_alloc(mrb_state *mrb);
-struct RProc *mrb_binding_wrap_lvspace(mrb_state *mrb, const struct RProc *proc, struct REnv **envp);
+mrb_value mrb_binding_new(mrb_state *mrb, const struct RProc *proc, mrb_value recv, struct REnv *env);
 
 static mrb_value
 mrb_proc_binding(mrb_state *mrb, mrb_value procval)
 {
-  mrb_value binding = mrb_binding_alloc(mrb);
   const struct RProc *proc = mrb_proc_ptr(procval);
   struct REnv *env;
 
@@ -30,10 +28,7 @@ mrb_proc_binding(mrb_state *mrb, mrb_value procval)
     receiver = MRB_ENV_LEN(env) > 0 ? env->stack[0] : mrb_nil_value();
   }
 
-  proc = mrb_binding_wrap_lvspace(mrb, proc, &env);
-  mrb_iv_set(mrb, binding, MRB_SYM(proc), mrb_obj_value((void*)proc));
-  mrb_iv_set(mrb, binding, MRB_SYM(recv), receiver);
-  mrb_iv_set(mrb, binding, MRB_SYM(env), mrb_obj_value(env));
+  mrb_value binding = mrb_binding_new(mrb, proc, receiver, env);
   mrb_iv_set(mrb, binding, MRB_SYM(source_location), mrb_proc_source_location(mrb, mrb_proc_ptr(procval)));
   return binding;
 }