diff --git a/.travis.yml b/.travis.yml
index 803995ed67..bc79fdab1c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1 +1,5 @@
+before_install:
+  - sudo apt-get -qq update
+  - sudo apt-get install -y bc
+
 script: ./build.sh raspberrypi all