1 files changed, 3 insertions, 3 deletions
diff --git a/vm.c b/vm.c
index bef90c0270..4f0e684bae 100644
--- a/vm.c
+++ b/vm.c
@@ -1246,7 +1246,7 @@ env_copy(const VALUE *src_ep, VALUE read_only_variables)
                         VALUE msg = rb_sprintf("can not make shareable Proc because it can refer"
                                                " unshareable object %+" PRIsVALUE " from ", v);
                         if (name)
-                            rb_str_catf(msg, "variable `%" PRIsVALUE "'", name);
+                            rb_str_catf(msg, "variable '%" PRIsVALUE "'", name);
                         else
                             rb_str_cat_cstr(msg, "a hidden variable");
                         rb_exc_raise(rb_exc_new_str(rb_eRactorIsolationError, msg));
@@ -1305,11 +1305,11 @@ proc_shared_outer_variables(struct rb_id_table *outer_variables, bool isolate, c
             rb_str_append(str, name);
         }
         if (*sep == ',') rb_str_cat_cstr(str, ")");
-        rb_str_cat_cstr(str, data.yield ? " and uses `yield'." : ".");
+        rb_str_cat_cstr(str, data.yield ? " and uses 'yield'." : ".");
         rb_exc_raise(rb_exc_new_str(rb_eArgError, str));
     }
     else if (data.yield) {
-        rb_raise(rb_eArgError, "can not %s because it uses `yield'.", message);
+        rb_raise(rb_eArgError, "can not %s because it uses 'yield'.", message);
     }
 
     return data.read_only;