diff --git a/contrib/teamcity/build-configurations.sh b/contrib/teamcity/build-configurations.sh
--- a/contrib/teamcity/build-configurations.sh
+++ b/contrib/teamcity/build-configurations.sh
@@ -2,13 +2,15 @@
 
 export LC_ALL=C.UTF-8
 
-set -euxo pipefail
+set -exo pipefail
 
 if [ -z "$ABC_BUILD_NAME" ]; then
   echo "Error: Environment variable ABC_BUILD_NAME must be set"
   exit 1
 fi
 
+set -u
+
 echo "Running build configuration '${ABC_BUILD_NAME}'..."
 
 TOPLEVEL=$(git rev-parse --show-toplevel)