diff --git a/scripts/install-worker.sh b/scripts/install-worker.sh
index 00256ee80..05c1b3f05 100644
--- a/scripts/install-worker.sh
+++ b/scripts/install-worker.sh
@@ -503,11 +503,15 @@ fi
 ### SSM Agent ##################################################################
 ################################################################################
 
-echo "Installing amazon-ssm-agent"
-if ! [[ ${ISOLATED_REGIONS} =~ $BINARY_BUCKET_REGION ]]; then
-  sudo yum install -y https://s3.${BINARY_BUCKET_REGION}.${S3_DOMAIN}/amazon-ssm-${BINARY_BUCKET_REGION}/${SSM_AGENT_VERSION}/linux_${ARCH}/amazon-ssm-agent.rpm
+if yum list installed | grep amazon-ssm-agent; then
+  echo "amazon-ssm-agent already present - skipping install"
 else
-  sudo yum install -y amazon-ssm-agent
+  echo "Installing amazon-ssm-agent"
+  if ! [[ ${ISOLATED_REGIONS} =~ $BINARY_BUCKET_REGION ]]; then
+    sudo yum install -y https://s3.${BINARY_BUCKET_REGION}.${S3_DOMAIN}/amazon-ssm-${BINARY_BUCKET_REGION}/${SSM_AGENT_VERSION}/linux_${ARCH}/amazon-ssm-agent.rpm
+  else
+    sudo yum install -y amazon-ssm-agent
+  fi
 fi
 
 ################################################################################