diff --git a/ChangeLog b/ChangeLog
index a083cd720c..d81d994df0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Jun  7 20:29:12 2012  Tanaka Akira  <akr@fsij.org>
+
+	* include/ruby/intern.h: rb_exec_arg and related stuff moved back from
+	  internal.h
+
 Thu Jun 07 15:53:03 2012  Koichi Sasada  <ko1@atdot.net>
 
 	* .gdbinit: add function `trace_machine_instructions' to trace
diff --git a/include/ruby/intern.h b/include/ruby/intern.h
index bc6f5da5fa..944c8f4131 100644
--- a/include/ruby/intern.h
+++ b/include/ruby/intern.h
@@ -588,7 +588,33 @@ VALUE rb_sym_all_symbols(void);
 /* process.c */
 void rb_last_status_set(int status, rb_pid_t pid);
 VALUE rb_last_status_get(void);
+struct rb_exec_arg {
+    int use_shell;
+    union {
+        struct {
+            VALUE shell_script;
+        } sh;
+        struct {
+            VALUE command_name;
+            VALUE command_abspath; /* full path string or nil */
+            VALUE argv_str;
+            VALUE argv_buf;
+        } cmd;
+    } invoke;
+    VALUE options;
+    VALUE redirect_fds;
+    VALUE envp_str;
+    VALUE envp_buf;
+    VALUE dup2_tmpbuf;
+};
 int rb_proc_exec(const char*);
+void rb_exec_arg_init(int argc, VALUE *argv, int accept_shell, struct rb_exec_arg *e);
+int rb_exec_arg_addopt(struct rb_exec_arg *e, VALUE key, VALUE val);
+void rb_exec_arg_fixup(struct rb_exec_arg *e);
+int rb_run_exec_options(const struct rb_exec_arg *e, struct rb_exec_arg *s);
+int rb_run_exec_options_err(const struct rb_exec_arg *e, struct rb_exec_arg *s, char*, size_t);
+int rb_exec(const struct rb_exec_arg*);
+int rb_exec_err(const struct rb_exec_arg*, char*, size_t);
 rb_pid_t rb_fork(int*, int (*)(void*), void*, VALUE);
 rb_pid_t rb_fork_err(int*, int (*)(void*, char*, size_t), void*, VALUE, char*, size_t);
 VALUE rb_f_exec(int,VALUE*);
diff --git a/internal.h b/internal.h
index 9ef4fba661..48a3a763d5 100644
--- a/internal.h
+++ b/internal.h
@@ -159,26 +159,6 @@ st_index_t rb_hash_proc(st_index_t hash, VALUE proc);
 
 /* process.c */
 
-struct rb_exec_arg {
-    int use_shell;
-    union {
-        struct {
-            VALUE shell_script;
-        } sh;
-        struct {
-            VALUE command_name;
-            VALUE command_abspath; /* full path string or nil */
-            VALUE argv_str;
-            VALUE argv_buf;
-        } cmd;
-    } invoke;
-    VALUE options;
-    VALUE redirect_fds;
-    VALUE envp_str;
-    VALUE envp_buf;
-    VALUE dup2_tmpbuf;
-};
-
 /* argv_str contains extra two elements.
  * The beginning one is for /bin/sh used by exec_with_sh.
  * The last one for terminating NULL used by execve.
@@ -186,14 +166,6 @@ struct rb_exec_arg {
 #define ARGVSTR2ARGC(argv_str) (RSTRING_LEN(argv_str) / sizeof(char *) - 2)
 #define ARGVSTR2ARGV(argv_str) ((char **)RSTRING_PTR(argv_str) + 1)
 
-void rb_exec_arg_init(int argc, VALUE *argv, int accept_shell, struct rb_exec_arg *e);
-int rb_exec_arg_addopt(struct rb_exec_arg *e, VALUE key, VALUE val);
-void rb_exec_arg_fixup(struct rb_exec_arg *e);
-int rb_run_exec_options(const struct rb_exec_arg *e, struct rb_exec_arg *s);
-int rb_run_exec_options_err(const struct rb_exec_arg *e, struct rb_exec_arg *s, char*, size_t);
-int rb_exec(const struct rb_exec_arg*);
-int rb_exec_err(const struct rb_exec_arg*, char*, size_t);
-
 /* rational.c */
 VALUE rb_lcm(VALUE x, VALUE y);
 VALUE rb_rational_reciprocal(VALUE x);