diff --git a/.bashrc b/.bashrc
index f08f595..4683c5a 100644
--- a/.bashrc
+++ b/.bashrc
@@ -25,7 +25,7 @@ alias psr="psu root"
 alias psu="ps -U"
 alias s="screen"
 alias smic="sudo env -i PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin /usr/bin/make install clean"
-alias ssh="ssh -4 -C -e none -v"
+alias ssh="ssh -C -e none -v"
 alias t="telnet"
 #
 export BLOCKSIZE="k"
diff --git a/.zshrc b/.zshrc
index b2cf7cf..7917788 100644
--- a/.zshrc
+++ b/.zshrc
@@ -23,7 +23,7 @@ alias "psr=psu root"
 alias "psu=ps -U"
 alias "s=screen"
 alias "smic=sudo make install clean"
-alias "ssh=ssh -4 -C -e none -v"
+alias "ssh=ssh -C -e none -v"
 alias "t=telnet"
 #
 if [[ -x /usr/bin/xdg-open ]]; then