diff --git a/install.sh b/install.sh
index 9909c07119..6ec1cd2cab 100755
--- a/install.sh
+++ b/install.sh
@@ -617,7 +617,11 @@ getshims() {
 killtree $({ set +x; } 2>/dev/null; getshims; set -x)
 
 do_unmount_and_remove() {
-    awk -v path="$1" '$2 ~ ("^" path) { print $2 }' /proc/self/mounts | sort -r | xargs -r -t -n 1 sh -c 'umount "$0" && rm -rf "$0"'
+    set +x
+    while read -r _ path _; do
+        case "$path" in $1*) echo "$path" ;; esac
+    done < /proc/self/mounts | sort -r | xargs -r -t -n 1 sh -c 'umount "$0" && rm -rf "$0"'
+    set -x
 }
 
 do_unmount_and_remove '/run/k3s'