diff --git a/src/vm/dumper.cpp b/src/vm/dumper.cpp
index 7eb99469..d3cca573 100644
--- a/src/vm/dumper.cpp
+++ b/src/vm/dumper.cpp
@@ -235,7 +235,7 @@ static BOOL dump_data_atom(LmnPortRef port, LmnAtomRef data, LmnLinkAttr attr) {
     break;
   case LMN_HL_ATTR: {
     char buf[18];
-    port_put_raw_s(port, EXCLAMATION_NAME);
+    port_put_raw_s(port, "!");// port_put_raw_s(port, HYPERLINK_NAME);
     if (lmn_env.show_hyperlink) {
       // sprintf(buf, "H%lx",
       sprintf(buf, "H%lu",
diff --git a/src/vm/functor.cpp b/src/vm/functor.cpp
index da46ba20..0cd1abc5 100644
--- a/src/vm/functor.cpp
+++ b/src/vm/functor.cpp
@@ -75,7 +75,7 @@ struct PredefinedFunctor predefined_functors[] = {
     {LMN_FALSE_FUNCTOR, FALSE, FALSE_ATOM_NAME, 1},
     /* hyperlinkは第二引数にHyperLink構造体へのポインタを埋め込むため二引数として登録する
      */
-    {LMN_EXCLAMATION_FUNCTOR, FALSE, EXCLAMATION_NAME, 2},
+    {LMN_EXCLAMATION_FUNCTOR, FALSE, HYPERLINK_NAME, 2},
 #ifdef USE_FIRSTCLASS_RULE
     {LMN_COLON_MINUS_FUNCTOR, FALSE, COLON_MINUS_ATOM_NAME, 3},
 #endif
diff --git a/src/vm/functor.h b/src/vm/functor.h
index e29cbfc7..8d3634bb 100644
--- a/src/vm/functor.h
+++ b/src/vm/functor.h
@@ -125,7 +125,7 @@ extern LmnFunctorTable *lmn_functor_table;
 #define MEM_EQ_ATOM_NAME "mem_eq"
 #define TRUE_ATOM_NAME "true"
 #define FALSE_ATOM_NAME "false"
-#define EXCLAMATION_NAME "!"
+#define HYPERLINK_NAME "!jRmVnNw.8xo[muc#qX" //通常atom名として使用されないようなランダム文字列
 
 #define LMN_IN_PROXY_FUNCTOR 0
 #define LMN_OUT_PROXY_FUNCTOR 1
diff --git a/src/vm/membrane.cpp b/src/vm/membrane.cpp
index 38c77260..1820aa0c 100644
--- a/src/vm/membrane.cpp
+++ b/src/vm/membrane.cpp
@@ -322,7 +322,7 @@ void move_symbol_atom_to_atom_tail(LmnSymbolAtomRef a, LmnSymbolAtomRef a1,
   a->set_next(a1);
 }
 
-void mem_push_symbol_atom(LmnMembraneRef mem, LmnSymbolAtomRef atom, bool no_check_hyperlink) {
+void mem_push_symbol_atom(LmnMembraneRef mem, LmnSymbolAtomRef atom) {
   AtomListEntry *as;
   LmnFunctor f = atom->get_functor();
 
@@ -352,7 +352,7 @@ void mem_push_symbol_atom(LmnMembraneRef mem, LmnSymbolAtomRef atom, bool no_che
 
   if (LMN_IS_PROXY_FUNCTOR(f)) {
     LMN_PROXY_SET_MEM(atom, mem);
-  } else if (LMN_FUNC_IS_HL(f) && !no_check_hyperlink) {
+  } else if (LMN_FUNC_IS_HL(f)) {
     LMN_HL_MEM(lmn_hyperlink_at_to_hl(atom)) = mem;
     mem->symb_atom_inc();
   } else if (f != LMN_UNIFY_FUNCTOR) {
@@ -4105,11 +4105,11 @@ void lmn_mem_delete_atom(LmnMembraneRef mem, LmnAtomRef atom,
   lmn_free_atom(atom, attr);
 }
 
-void lmn_mem_push_atom(LmnMembraneRef mem, LmnAtomRef atom, LmnLinkAttr attr, bool no_check_hyperlink) {
+void lmn_mem_push_atom(LmnMembraneRef mem, LmnAtomRef atom, LmnLinkAttr attr) {
   if (LMN_ATTR_IS_DATA_WITHOUT_EX(attr)) {
     mem->data_atom_inc();
   } else { /* symbol atom */
-    mem_push_symbol_atom(mem, (LmnSymbolAtomRef)atom, no_check_hyperlink);
+    mem_push_symbol_atom(mem, (LmnSymbolAtomRef)atom);
   }
 }
 
diff --git a/src/vm/membrane.h b/src/vm/membrane.h
index 6c3f211f..0a0df8b2 100644
--- a/src/vm/membrane.h
+++ b/src/vm/membrane.h
@@ -126,7 +126,7 @@ LmnRuleSetRef lmn_mem_get_ruleset(LmnMembraneRef m, int i);
 
 void lmn_mem_rulesets_destroy(const std::vector<LmnRuleSet *> &rulesets);
 void lmn_mem_rulesets_destroy(Vector *rulesets);
-void mem_push_symbol_atom(LmnMembraneRef mem, LmnSymbolAtomRef atom, bool no_check_hyperlink = false);
+void mem_push_symbol_atom(LmnMembraneRef mem, LmnSymbolAtomRef atom);
 void lmn_mem_add_ruleset_sort(std::vector<LmnRuleSet *> *rulesets, LmnRuleSetRef ruleset);
 
 
@@ -181,7 +181,7 @@ void mem_remove_symbol_atom_with_buddy_data(LmnMembraneRef mem,
                                             LmnSymbolAtomRef atom);
 void lmn_mem_remove_atom(LmnMembraneRef mem, LmnAtomRef atom, LmnLinkAttr attr);
 void lmn_mem_delete_atom(LmnMembraneRef mem, LmnAtomRef atom, LmnLinkAttr attr);
-void lmn_mem_push_atom(LmnMembraneRef mem, LmnAtomRef atom, LmnLinkAttr attr, bool no_check_hyperlink = false);
+void lmn_mem_push_atom(LmnMembraneRef mem, LmnAtomRef atom, LmnLinkAttr attr);
 void alter_functor(LmnMembraneRef mem, LmnSymbolAtomRef atom, LmnFunctor f);
 void lmn_mem_add_ruleset(LmnMembraneRef mem, LmnRuleSetRef ruleset);
 void newlink_symbol_and_something(LmnSymbolAtomRef atom0, int pos,
diff --git a/src/vm/task.cpp b/src/vm/task.cpp
index 9ce01c52..94c92c3d 100644
--- a/src/vm/task.cpp
+++ b/src/vm/task.cpp
@@ -1739,7 +1739,7 @@ bool slim::vm::interpreter::exec_command(LmnReactCxt *rc, LmnRuleRef rule,
       }
 #endif
     }
-    lmn_mem_push_atom((LmnMembraneRef)rc->wt(memi), (LmnAtomRef)ap, attr, true);
+    lmn_mem_push_atom((LmnMembraneRef)rc->wt(memi), (LmnAtomRef)ap, attr);
     rc->reg(atomi) = {(LmnWord)ap, attr, TT_ATOM};
     break;
   }
@@ -2796,7 +2796,7 @@ bool slim::vm::interpreter::exec_command(LmnReactCxt *rc, LmnRuleRef rule,
         }
         case LMN_HL_ATTR: {
           char buf[16];
-          port_put_raw_s(port, EXCLAMATION_NAME);
+          port_put_raw_s(port, HYPERLINK_NAME);
           sprintf(buf, "%lx",
                   LMN_HL_ID(LMN_HL_ATOM_ROOT_HL(
                       (LmnSymbolAtomRef)rc->wt(srcvec->get(0)))));