diff --git a/scripts-dev/config-lint.sh b/scripts-dev/config-lint.sh
index e9ae401dfaeb..487dbb6e84f5 100755
--- a/scripts-dev/config-lint.sh
+++ b/scripts-dev/config-lint.sh
@@ -2,6 +2,8 @@
 # Find linting errors in Synapse's default config file.
 # Exits with 0 if there are no problems, or another code otherwise.
 
+set -ex
+
 # Fix non-lowercase true/false values
 sed -i -E "s/(#.*): +True/\1: true/g; s/(#.*): +False/\1: false/g;" synapse/config/*.py