diff --git a/install-zfs.sh b/install-zfs.sh
index 60f14f3..96bfd68 100755
--- a/install-zfs.sh
+++ b/install-zfs.sh
@@ -167,6 +167,7 @@ function invoke {
 #
 function hot_swap_script {
   if [[ -f $c_hotswap_file ]]; then
+    # shellcheck disable=1090 # can't follow; the file might not exist anyway.
     source "$c_hotswap_file"
   fi
 }