diff --git a/debian/prune-unused-deps b/debian/prune-unused-deps
index 6c74b953c4..a8b656f7b3 100755
--- a/debian/prune-unused-deps
+++ b/debian/prune-unused-deps
@@ -15,6 +15,7 @@ for i in "$scriptdir/debian/patches"/d-00*.patch; do
 done
 test -f Cargo.lock.orig || cp Cargo.lock Cargo.lock.orig
 rm -f Cargo.lock
+find vendor -name .cargo-checksum.json -execdir "$scriptdir/debian/prune-checksums" "{}" +
 sed -i -e 's/dev: 1/#dev: 1/g' src/stage0.txt # allow beta builds
 ./x.py build nonexistent/path/to/trigger/cargo/metadata src/bootstrap