diff --git a/servo-build-dependencies/init.sls b/servo-build-dependencies/init.sls
index 1404dd3e..281fa452 100644
--- a/servo-build-dependencies/init.sls
+++ b/servo-build-dependencies/init.sls
@@ -30,6 +30,7 @@ servo-dependencies:
       - libgles2-mesa-dev
       - libosmesa6-dev
       - libssl-dev
+      - llvm-3.5-dev
       - xorg-dev
       - xpra
       - xserver-xorg-input-void