diff --git a/init-letsencrypt.sh b/init-letsencrypt.sh
index 0f15e68..702c6a9 100644
--- a/init-letsencrypt.sh
+++ b/init-letsencrypt.sh
@@ -1,5 +1,10 @@
 #!/bin/bash
 
+if ! [ -x "$(command -v docker-compose)" ]; then
+  echo 'Error: docker-compose is not installed.' >&2
+  exit 1
+fi
+
 domains=(example.com www.example.com)
 rsa_key_size=4096
 data_path="./data/certbot"