diff --git a/files/nrpe/check_reboot_required b/files/nrpe/check_reboot_required
index 6d3f992..0379caf 100755
--- a/files/nrpe/check_reboot_required
+++ b/files/nrpe/check_reboot_required
@@ -104,12 +104,13 @@ if [ "$reboot_needed" -eq 0 ]; then
             | tail -1)
     fi
 
-    # Proxmox: proxmox-kernel-<version>
+    # Proxmox: proxmox-kernel-<version>[-signed]
     if [ -z "$installed_kernel" ]; then
         installed_kernel=$(dpkg -l "proxmox-kernel-*" 2>/dev/null \
             | awk '/^ii/{print $2}' \
             | sed 's/^proxmox-kernel-//' \
             | grep -E '^[0-9]' \
+            | sed 's/-signed$//' \
             | sort -V \
             | tail -1)
     fi