diff --git a/.bashrc b/.bashrc
index 5c83f03..e5d4470 100644
--- a/.bashrc
+++ b/.bashrc
@@ -28,6 +28,7 @@ export EDITOR="vim"
 export GIT_PAGER="less"
 export LESS="-EfmrSw"
 export PAGER="most"
+export PERL_CPANM_OPT="--mirror http://cpan.nctu.edu.tw/"
 #
 shopt -s checkwinsize
 shopt -s histappend
diff --git a/csh.cshrc b/csh.cshrc
index 2ad2d61..7672b8f 100644
--- a/csh.cshrc
+++ b/csh.cshrc
@@ -36,4 +36,5 @@ setenv EDITOR "/usr/local/bin/vim"
 setenv LESS "-EfmrSw"
 setenv LSCOLORS "gxfxcxdxbxegedabagacad"
 setenv PAGER "/usr/local/bin/most"
+setenv PERL_CPANM_OPT="--mirror http://cpan.nctu.edu.tw/"
 setenv VISUAL $EDITOR