diff --git a/python/ray/autoscaler/aws/example-full.yaml b/python/ray/autoscaler/aws/example-full.yaml
index 2c83ed7e0..189cc144f 100644
--- a/python/ray/autoscaler/aws/example-full.yaml
+++ b/python/ray/autoscaler/aws/example-full.yaml
@@ -136,7 +136,7 @@ setup_commands:
 
 # Custom commands that will be run on the head node after common setup.
 head_setup_commands:
-    - pip install boto3>=1.4.8  # 1.4.8 adds InstanceMarketOptions
+    - pip install 'boto3>=1.4.8'  # 1.4.8 adds InstanceMarketOptions
 
 # Custom commands that will be run on worker nodes after common setup.
 worker_setup_commands: []
diff --git a/python/ray/autoscaler/aws/example-ml.yaml b/python/ray/autoscaler/aws/example-ml.yaml
index 0a965bbf5..6353f3c84 100644
--- a/python/ray/autoscaler/aws/example-ml.yaml
+++ b/python/ray/autoscaler/aws/example-ml.yaml
@@ -139,7 +139,7 @@ setup_commands:
 
 # Custom commands that will be run on the head node after common setup.
 head_setup_commands:
-    - pip install boto3>=1.4.8  # 1.4.8 adds InstanceMarketOptions
+    - pip install 'boto3>=1.4.8'  # 1.4.8 adds InstanceMarketOptions
 
 # Custom commands that will be run on worker nodes after common setup.
 worker_setup_commands: []