diff --git a/hooks/busybox/extract00.sh b/hooks/busybox/extract00.sh
index d7c0e03..8c16e9d 100755
--- a/hooks/busybox/extract00.sh
+++ b/hooks/busybox/extract00.sh
@@ -4,4 +4,7 @@ set -exu
 
 rootdir="$1"
 
-chroot "$rootdir" busybox --install -s
+# Run busybox using an absolute path so that this script also works in case
+# /proc is not mounted. Busybox uses /proc/self/exe to figure out the path
+# to its executable.
+chroot "$rootdir" /bin/busybox --install -s