diff --git a/shell/mount.sh b/shell/mount.sh
index b27b1a2..0211131 100644
--- a/shell/mount.sh
+++ b/shell/mount.sh
@@ -94,9 +94,12 @@ chroot \
 "
 
 ur() {
-	local f
-	for f in "sys" "proc" "dev/pts" "dev"; do
-		umount --lazy "overlay/mount/${f}"
+	local directory
+	for directory in "sys" "proc" "dev/pts" "dev"; do
+		if ! umount --lazy "overlay/mount/${directory}"; then
+			log_error "Unable to bind unmount directory: ${directory}"
+			return 1
+		fi
 	done
 }