diff --git a/.gitlab-ci/container/build-libclc.sh b/.gitlab-ci/container/build-libclc.sh
index 9ec3e3c55bb..48cf5ff8138 100644
--- a/.gitlab-ci/container/build-libclc.sh
+++ b/.gitlab-ci/container/build-libclc.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -ex
+set -uex
 
 export LLVM_CONFIG="llvm-config-${LLVM_VERSION:?"llvm unset!"}"
 LLVM_TAG="llvmorg-15.0.7"