diff --git a/ChangeLog b/ChangeLog
index 9eaa550a6c..33d01613c8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,4 @@
-Wed Nov 11 12:53:25 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Wed Nov 11 12:54:02 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* hash.c (ruby_setenv): use ruby_strdup().
 
diff --git a/hash.c b/hash.c
index bc5e5b3009..2ae9a7dd2f 100644
--- a/hash.c
+++ b/hash.c
@@ -2069,7 +2069,7 @@ ruby_setenv(const char *name, const char *value)
 	for (max = i; environ[max]; max++) ;
 	tmpenv = ALLOC_N(char*, max+2);
 	for (j=0; j<max; j++)		/* copy environment */
-	    tmpenv[j] = strdup(environ[j]);
+	    tmpenv[j] = ruby_strdup(environ[j]);
 	tmpenv[max] = 0;
 	environ = tmpenv;		/* tell exec where it is now */
     }