diff --git a/python/ray/autoscaler/aws/development-example.yaml b/python/ray/autoscaler/aws/development-example.yaml
index 678f8365f..662b44a20 100644
--- a/python/ray/autoscaler/aws/development-example.yaml
+++ b/python/ray/autoscaler/aws/development-example.yaml
@@ -87,7 +87,7 @@ setup_commands:
     # - sudo dpkg --configure -a
     # Install basics.
     - sudo apt-get update
-    - sudo apt-get install -y cmake pkg-config build-essential autoconf curl libtool unzip python
+    - sudo apt-get install -y cmake pkg-config build-essential autoconf curl libtool unzip flex bison python
     # Install Anaconda.
     - wget https://repo.continuum.io/archive/Anaconda3-5.0.1-Linux-x86_64.sh || true
     - bash Anaconda3-5.0.1-Linux-x86_64.sh -b -p $HOME/anaconda3 || true