diff --git a/images/ubuntu/scripts/build/configure-apt-sources.sh b/images/ubuntu/scripts/build/configure-apt-sources.sh
index 6d6769240..b002e2f6a 100644
--- a/images/ubuntu/scripts/build/configure-apt-sources.sh
+++ b/images/ubuntu/scripts/build/configure-apt-sources.sh
@@ -13,12 +13,12 @@ printf "https://archive.ubuntu.com/ubuntu/\tpriority:2\n" | tee -a /etc/apt/apt-
 printf "https://security.ubuntu.com/ubuntu/\tpriority:3\n" | tee -a /etc/apt/apt-mirrors.txt
 
 if is_ubuntu24; then
-    sed -i 's/http:\/\/azure.archive.ubuntu.com\/ubuntu\//mirror+file:\/etc\/apt\/apt-mirrors.txt/' /etc/apt/sources.list.d/ubuntu.sources
+    sed -i 's|http://azure\.archive\.ubuntu\.com/ubuntu/|mirror+file:/etc/apt/apt-mirrors.txt|' /etc/apt/sources.list.d/ubuntu.sources
 
     # Apt changes to survive Cloud Init
     cp -f /etc/apt/sources.list.d/ubuntu.sources  /etc/cloud/templates/sources.list.ubuntu.deb822.tmpl
 else
-    sed -i 's/http:\/\/azure.archive.ubuntu.com\/ubuntu\//mirror+file:\/etc\/apt\/apt-mirrors.txt/' /etc/apt/sources.list
+    sed -i 's|http://azure\.archive\.ubuntu\.com/ubuntu/|mirror+file:/etc/apt/apt-mirrors.txt|' /etc/apt/sources.list
 
     # Apt changes to survive Cloud Init
     cp -f /etc/apt/sources.list /etc/cloud/templates/sources.list.ubuntu.tmpl