diff --git a/linux.install b/linux.install
index cb44e4e..995fdca 100644
--- a/linux.install
+++ b/linux.install
@@ -44,11 +44,9 @@ post_upgrade() {
     echo ">>>"
   fi
 
-  if grep "^[^#]*[[:space:]]/boot" etc/fstab 2>&1 >/dev/null; then
-    if ! grep "[[:space:]]/boot" etc/mtab 2>&1 >/dev/null; then
-      echo "WARNING: /boot appears to be a separate partition but is not mounted."
-      echo "         You probably just broke your system. Congratulations."
-    fi
+  if findmnt --fstab -uno SOURCE /boot &>/dev/null && ! mountpoint -q /boot; then
+    echo "WARNING: /boot appears to be a separate partition but is not mounted."
+    echo "         You probably just broke your system. Congratulations."
   fi
 
   # updating module dependencies