diff --git a/Dockerfile.test b/Dockerfile.test
index 7c04e8f..c5e4719 100644
--- a/Dockerfile.test
+++ b/Dockerfile.test
@@ -1,7 +1,7 @@
 ARG COMPILE_R7RS=chibi
 FROM schemers/sagittarius AS build
 RUN apt-get update && apt-get install -y wget build-essential make cmake libgc-dev zlib1g-dev libffi-dev libssl-dev
-RUN wget https://github.com/ktakashi/sagittarius-scheme/archive/refs/tags/version_0.9.12.tar.gz
+RUN wget https://github.com/ktakashi/sagittarius-scheme/archive/refs/tags/version_0.9.12.tar.gz && tar -xf version_0.9.12.tar.gz
 RUN cd sagittarius-scheme-version_0.9.12 && ./dist.sh gen && mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX=/usr/local-other .. && make && make install
 
 FROM schemers/${COMPILE_R7RS}