diff --git a/ChangeLog b/ChangeLog
index 53a396d708..2eff9f5e80 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Jun  5 19:59:13 2012  Tanaka Akira  <akr@fsij.org>
+
+	* process.c (strtok): declaration removed because it is not used.
+
 Tue Jun  5 19:33:51 2012  Tanaka Akira  <akr@fsij.org>
 
 	* process.c (proc_spawn): don't detect simple command line here
diff --git a/process.c b/process.c
index 98c984ba84..cceb67f49a 100644
--- a/process.c
+++ b/process.c
@@ -982,10 +982,6 @@ proc_detach(VALUE obj, VALUE pid)
     return rb_detach_process(NUM2PIDT(pid));
 }
 
-#ifndef HAVE_STRING_H
-char *strtok();
-#endif
-
 static int forked_child = 0;
 
 #ifdef SIGPIPE