diff --git a/deployment/proxmox/provision.sh b/deployment/proxmox/provision.sh
index 89b1536..2930d30 100755
--- a/deployment/proxmox/provision.sh
+++ b/deployment/proxmox/provision.sh
@@ -85,7 +85,7 @@ readonly memory
 ## FIXME: When we figure out how to use other nodes than node051.
 # if [ -z "$node" ]; then
 #   printf 'Picking random node...'
-#   proxmox GET $api_url/nodes
+#   proxmox GET "$api_url/nodes"
 #   node=$(from_response .data[].node | sort -R | head -n 1)
 #   printf " done. Picked '%s'.\n" "$node"
 # fi
@@ -98,7 +98,7 @@ printf 'Authenticating...'
 response=$(
     http \
         --verify no \
-        POST $api_url/access/ticket \
+        POST "$api_url/access/ticket" \
         "username=$username" \
         "password=$password"
     )
@@ -170,7 +170,7 @@ upload_iso () {
   acquire_lock upload
   printf 'Uploading ISO for VM %d...\n' "$1"
 
-  proxmox_sync POST"$api_url/nodes/$node/storage/local/upload" \
+  proxmox_sync POST "$api_url/nodes/$node/storage/local/upload" \
     "filename@$tmpdir/installer-fedi$1.iso" \
     content==iso