diff --git a/tools/setup_gate.sh b/tools/setup_gate.sh
index 94f887a72f6ac42d36b98c72bbd12622b573eab7..c81f5bcf4525f3c6d4d604a49cd4e7408f0a895b 100755
--- a/tools/setup_gate.sh
+++ b/tools/setup_gate.sh
@@ -3,6 +3,9 @@
 set -o xtrace
 set -o errexit
 
+# Enable unbuffered output for Ansible in Jenkins.
+export PYTHONUNBUFFERED=1
+
 # Just for mandre :)
 if [[ ! -f /etc/sudoers.d/jenkins ]]; then
     echo "jenkins ALL=(:docker) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/jenkins