diff --git a/nodepool/scripts/convert_node_to_xenserver.sh b/nodepool/scripts/convert_node_to_xenserver.sh
index 6ea16b1128..4b367b19bd 100755
--- a/nodepool/scripts/convert_node_to_xenserver.sh
+++ b/nodepool/scripts/convert_node_to_xenserver.sh
@@ -163,11 +163,11 @@ function get_state {
 }
 
 function create_resizing_initramfs_config {
-    cp "$THIS_DIR/xenserver_helper_initramfs_hook.sh" \
+    cp "$THIS_DIR/xenserver_helper_initramfs_hook" \
         /usr/share/initramfs-tools/hooks/resize
     chmod +x /usr/share/initramfs-tools/hooks/resize
 
-    cp "$THIS_DIR/xenserver_helper_initramfs_premount.sh" \
+    cp "$THIS_DIR/xenserver_helper_initramfs_premount" \
         /usr/share/initramfs-tools/scripts/local-premount/resize
     chmod +x /usr/share/initramfs-tools/scripts/local-premount/resize
 }
diff --git a/nodepool/scripts/xenserver_helper_initramfs_hook.sh b/nodepool/scripts/xenserver_helper_initramfs_hook
similarity index 95%
rename from nodepool/scripts/xenserver_helper_initramfs_hook.sh
rename to nodepool/scripts/xenserver_helper_initramfs_hook
index 6ce9d4477a..328b197cdf 100644
--- a/nodepool/scripts/xenserver_helper_initramfs_hook.sh
+++ b/nodepool/scripts/xenserver_helper_initramfs_hook
@@ -4,7 +4,7 @@ set -e
 
 PREREQ=""
 
-function prereqs {
+prereqs () {
     echo "${PREREQ}"
 }
 
diff --git a/nodepool/scripts/xenserver_helper_initramfs_premount.sh b/nodepool/scripts/xenserver_helper_initramfs_premount
similarity index 97%
rename from nodepool/scripts/xenserver_helper_initramfs_premount.sh
rename to nodepool/scripts/xenserver_helper_initramfs_premount
index e17f37d436..3f7dc9b874 100644
--- a/nodepool/scripts/xenserver_helper_initramfs_premount.sh
+++ b/nodepool/scripts/xenserver_helper_initramfs_premount
@@ -5,7 +5,8 @@ set -ex
 PREREQ=""
 
 # Output pre-requisites
-function prereqs {
+prereqs()
+{
         echo "$PREREQ"
 }