diff --git a/docs/src/run-with-lambda.md b/docs/src/run-with-lambda.md
index e7c46270..de2cd3f1 100644
--- a/docs/src/run-with-lambda.md
+++ b/docs/src/run-with-lambda.md
@@ -60,7 +60,7 @@ Every zip-based Lambda function runs a file called `bootstrap`.
 cat <<EOF >src/bootstrap
 #!/bin/sh
 set -eu
-exec martin --config ${_HANDLER}.yaml
+exec martin --config \${_HANDLER}.yaml
 EOF
 ```