diff --git a/precise/base-0k/hooks/install b/precise/base-0k/hooks/install
index 2561a9a..8720963 100755
--- a/precise/base-0k/hooks/install
+++ b/precise/base-0k/hooks/install
@@ -99,13 +99,22 @@ EOF
 ## kal-scripts
 ##
 
-cat <<EOF >> /etc/apt/sources.list
+##
+## kal-scripts
+##
+
+if ! [ -e /etc/apt/sources.list.d/kalysto.org.list ]; then
+    cat <<EOF > /etc/apt/sources.list.d/kalysto.org.list
 
 ## vlab's shell libraries
 deb http://deb.kalysto.org no-dist kal-alpha kal-beta kal-main
 
 EOF
 
+    ## Update only this repo:
+    apt-get update -o Dir::Etc::sourcelist="sources.list.d/kalysto.org.list" \
+        -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0"
+fi
 
 ##
 ## More shell configurations (prompt, functions)