diff --git a/e2e/forwarding/generate_certificates.sh b/e2e/forwarding/generate_certificates.sh
index 5052a8925..4df299c4e 100755
--- a/e2e/forwarding/generate_certificates.sh
+++ b/e2e/forwarding/generate_certificates.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ../../nebula-cert ca -name "E2E test CA"
 ../../nebula-cert sign -name "A" -ip "192.168.100.1/24" -out-crt a.crt -out-key a.key
 ../../nebula-cert sign -name "B" -ip "192.168.100.2/24" -out-crt b.crt -out-key b.key