diff --git a/save-deploy/base-images/Dockerfile b/save-deploy/base-images/Dockerfile
index 3de718a592..2e6b5321bb 100644
--- a/save-deploy/base-images/Dockerfile
+++ b/save-deploy/base-images/Dockerfile
@@ -8,7 +8,7 @@ RUN rm -rf /var/lib/apt/lists/*
 
 # clang-12 can only be installed to ubuntu and is only needed for GSAC contest
 RUN if [ "$BASE_IMAGE_NAME" = "ubuntu" ]; then \
-    apt-get update && env DEBIAN_FRONTEND="noninteractive" apt-get install clang-12 clang-format libclang-12-dev \
+    apt-get update && env DEBIAN_FRONTEND="noninteractive" apt-get install -y clang-12 clang-format libclang-12-dev; \
     fi
 
 # Fixme: https://github.com/saveourtool/save-cloud/issues/352