diff --git a/bashrc b/bashrc
index f78cb704..95e32c0a 100644
--- a/bashrc
+++ b/bashrc
@@ -402,6 +402,9 @@ alias info="echo 'I don't know anyone who likes and uses info pages, so I aliase
 # To have less handle ls colours
 alias less="less -R "
 
+# "su -" with sudo
+alias ssu="sudo -i "
+
 # Allow custom aliases to be put in .aliases or .bash_aliases .
 
 # .aliases
diff --git a/zshrc b/zshrc
index d54e0c6b..2da726a5 100644
--- a/zshrc
+++ b/zshrc
@@ -360,6 +360,9 @@ alias history="history -i "
 # To have less handle ls colours
 alias less="less -R "
 
+# "su -" with sudo
+alias ssu="sudo -i "
+
 # .aliases
 if [ -f ~/.aliases ]; then
     source ~/.aliases