diff --git a/Jenkinsfile b/Jenkinsfile
index f988344..231d391 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -32,7 +32,7 @@ pipeline {
                                             DOCKERIMG="${implementation}:head"
                                         }
                                         sh "docker build --build-arg IMAGE=${DOCKERIMG} --build-arg SCHEME=${implementation} --tag=foreign-c-test-${implementation} -f dockerfiles/Dockerfile.snow-chibi-install-test ."
-                                            sh "docker run -v ${WORKSPACE}:/workdir -w /workdir -t foreign-c-test-${implementation} sh -c \"timeout 120 make SCHEME=${implementation} clean install-jenkins && cp tests/hello.scm /tmp/ && cd /tmp && SCHEME=${implementation} timeout 120 printf \"\\n\" | compile-r7rs -o hello hello.scm && timeout 120 printf \"\\n\" | ./hello\""
+                                            sh "docker run -v ${WORKSPACE}:/workdir -w /workdir -t foreign-c-test-${implementation} sh -c \"timeout 120 make SCHEME=${implementation} clean install-jenkins && cp tests/hello.scm /tmp/ && cd /tmp && SCHEME=${implementation} printf \"\\n\" | timeout 120 compile-r7rs -o hello hello.scm && printf \"\\n\" | timeout 120 ./hello\""
                                     }
                                 }
                                 tests.each { test ->
diff --git a/dockerfiles/Dockerfile.test b/dockerfiles/Dockerfile.test
index 8f6d89e..0c5a016 100644
--- a/dockerfiles/Dockerfile.test
+++ b/dockerfiles/Dockerfile.test
@@ -1,7 +1,10 @@
 ARG SCHEME=chibi
 ARG IMAGE=chibi:head
 FROM schemers/${IMAGE}
-RUN apt-get update && apt-get install -y \
+RUN apt-get update && apt-get install \
+    --no-install-suggests \
+    --no-install-recommends \
+    -y \
     build-essential \
     make \
     libffi-dev \