diff --git a/ChangeLog b/ChangeLog
index 84bfa9e25a..6af40237e6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Jun  9 09:00:58 2012  Tanaka Akira  <akr@fsij.org>
+
+	* process.c (rb_proc_exec): call before_exec() here addition to
+	  rb_exec_err.
+
 Sat Jun  9 08:30:52 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* thread_pthread.c (ruby_init_stack): use stack info if possible.
diff --git a/process.c b/process.c
index 988432b02f..adaa20a46e 100644
--- a/process.c
+++ b/process.c
@@ -1174,7 +1174,9 @@ proc_exec_sh(const char *str, VALUE envp_str)
 int
 rb_proc_exec(const char *str)
 {
-    int ret = proc_exec_sh(str, Qfalse);
+    int ret;
+    before_exec();
+    ret = proc_exec_sh(str, Qfalse);
     preserving_errno(after_exec());
     return ret;
 }