diff --git a/.travis.yml b/.travis.yml
index 3b50444..08cefab 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,7 @@ jdk:
 cache:
   directories:
   - $HOME/protobuf
-  - $HOME/.m2
+  - $home/.m2
 
 before_install:
   - ./scripts/install-protobuf.sh
diff --git a/scripts/install-protobuf.sh b/scripts/install-protobuf.sh
index dc1d98c..596e869 100755
--- a/scripts/install-protobuf.sh
+++ b/scripts/install-protobuf.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-set -e
+set -ex
 if [ ! -d "$HOME/protobuf/lib" ]; then
   wget https://github.com/google/protobuf/releases/download/v2.6.1/protobuf-2.6.1.tar.gz
   tar -xzvf protobuf-2.6.1.tar.gz