diff --git a/ZFS/fix-zfs-compile.sh b/ZFS/fix-zfs-compile.sh
index cbc1d74..5c5ff8b 100644
--- a/ZFS/fix-zfs-compile.sh
+++ b/ZFS/fix-zfs-compile.sh
@@ -1,10 +1,13 @@
 #!/bin/bash
 
-# arg1=kernel ver
-cd /usr/src/linux-headers-$1-common/include/linux
-td=$PWD
+# REF: https://github.com/openzfs/zfs/issues/9935
+# Fix compile issues on Debian
 
-cd /usr/src/linux-headers-$1-amd64/include
-ln -sfn $td . 
+# arg1=kernel ver e.g. 4.19.9
+cd /usr/src/linux-headers-$1-common/include/linux
+td=$PWD; [ "$td" = "" ] && exit 404;
+
+cd /usr/src/linux-headers-$1-amd64/include && \
+  ln -sfn $td . 
 
 ls -alh