diff --git a/ChangeLog b/ChangeLog
index 738adeff5e..69ee94f9df 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Sep  5 21:02:54 2014  Tanaka Akira  <akr@fsij.org>
+
+	* process.c (handle_fork_error): Make try_gc_p argument volatile to
+	  suppress "clobbered" warning.
+
 Fri Sep  5 20:48:06 2014  Tanaka Akira  <akr@fsij.org>
 
 	* process.c (handle_fork_error): Don't need state_p argument.
diff --git a/process.c b/process.c
index 165e769080..5dd505b559 100644
--- a/process.c
+++ b/process.c
@@ -3159,7 +3159,7 @@ pipe_nocrash(int filedes[2], VALUE fds)
 #endif
 
 static int
-handle_fork_error(int *status, int *ep, int *try_gc_p)
+handle_fork_error(int *status, int *ep, volatile int *try_gc_p)
 {
     int state = 0;
 
@@ -3390,7 +3390,7 @@ retry_fork_async_signal_safe(int *status, int *ep,
         char *errmsg, size_t errmsg_buflen)
 {
     rb_pid_t pid;
-    int try_gc = 1;
+    volatile int try_gc = 1;
 
     while (1) {
         prefork();