diff --git a/ci/build-docker-image.sh b/ci/build-docker-image.sh
index 060dc78b..8a8a08e5 100755
--- a/ci/build-docker-image.sh
+++ b/ci/build-docker-image.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-set -eu
+set -u
 
 if [ "$#" -lt 2 ]; then
 	echo 'Usage: build-docker-image.sh <dockerFile> <dockerImageTag> [<dockerBuildArgs>...]' >&2