diff --git a/debian-bootstrap.sh b/debian-bootstrap.sh
index 50a8f511..59bc9abc 100755
--- a/debian-bootstrap.sh
+++ b/debian-bootstrap.sh
@@ -177,7 +177,7 @@ echo "/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/" > /etc/ld.so.conf
     && ldconfig
 
 # llvm-4.0 for llvm-hs (separate since it needs wget)
-wget -O - http://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
-add-apt-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-4.0 main"
-apt-get update
-apt-get install llvm-4.0
+wget -O - http://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - \
+    && add-apt-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-4.0 main" \
+    && apt-get update \
+    && apt-get install -y llvm-4.0