diff --git a/ChangeLog b/ChangeLog
index 95afc77b06..c696c5f7b6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Jul 22 19:57:47 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_core.h: remove unused declaration of
+	  iseq_compile_data_ensure_node_stack.
+
 Wed Jul 22 19:52:45 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_core.h: separate rb_iseq_body into rb_iseq_constant_body and
diff --git a/vm_core.h b/vm_core.h
index 6e3d9cce58..1544c9a6d9 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -152,12 +152,8 @@ enum ruby_vm_throw_flags {
 };
 
 /* iseq data type */
-
-struct iseq_compile_data_ensure_node_stack;
-
 typedef struct rb_compile_option_struct rb_compile_option_t;
 
-
 struct iseq_inline_cache_entry {
     rb_serial_t ic_serial;
     rb_cref_t *ic_cref;