diff --git a/travis/macos-install.sh b/travis/macos-install.sh
index ad17e25..1e873c9 100755
--- a/travis/macos-install.sh
+++ b/travis/macos-install.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 brew install python3
 which python3
 python3 --version