diff --git a/tasks/setup-debian-vanilla.yml b/tasks/setup-debian-vanilla.yml
index 757735f..1749bb3 100644
--- a/tasks/setup-debian-vanilla.yml
+++ b/tasks/setup-debian-vanilla.yml
@@ -19,7 +19,9 @@
   changed_when: False
 
 - set_fact:
-    kernel_header_version: {{ '-cloud-' in ansible_kernel | ternary(ansible_kernel,dpkg_arch.stdout) }}
+    kernel_header_version: "{{ ('-cloud-' in ansible_kernel) | ternary(ansible_kernel,dpkg_arch.stdout) }}"
+
+- debug: msg="kernel_header_version {{ kernel_header_version }}"
 
 - name: (Debian) Install kernel headers to compile Wireguard with DKMS
   apt: