diff --git a/build.Dockerfile b/build.Dockerfile
index 8f4cda2f57..fdc03795d2 100644
--- a/build.Dockerfile
+++ b/build.Dockerfile
@@ -68,9 +68,9 @@ WORKDIR $WORKHOME/worker
 
 COPY . .
 
-RUN --mount=type=cache,id=cargo-registry-cache,target=/opt/rust/registry/cache \
-    --mount=type=cache,id=cargo-registry-index,target=/opt/rust/registry/index \
-	--mount=type=cache,id=cargo-git,target=/opt/rust/git/db \
+RUN --mount=type=cache,id=cargo-registry-cache,target=/opt/rust/registry/cache,sharing=private \
+	--mount=type=cache,id=cargo-registry-index,target=/opt/rust/registry/index,sharing=private \
+	--mount=type=cache,id=cargo-git,target=/opt/rust/git/db,sharing=private \
 	--mount=type=cache,id=cargo-sccache-${WORKER_MODE}${ADDITIONAL_FEATURES},target=/home/ubuntu/.cache/sccache \
 	echo ${FINGERPRINT} && make && make identity && cargo test --release && sccache --show-stats