diff --git a/.ssh/config.d/99_ec2 b/.ssh/config.d/99_ec2
new file mode 100644
index 0000000000000000000000000000000000000000..d23a1b56b6c1f3e4295431c811a1825208055c65
--- /dev/null
+++ b/.ssh/config.d/99_ec2
@@ -0,0 +1,5 @@
+# Disable SSH host key checking for EC2 instances.
+
+Host  *.compute-1.amazonaws.com
+UserKnownHostsFile /dev/null
+StrictHostKeyChecking no