diff --git a/tests/unit/20_build-env.bats b/tests/unit/20_build-env.bats
index 48e2626b0..8b59c61c5 100644
--- a/tests/unit/20_build-env.bats
+++ b/tests/unit/20_build-env.bats
@@ -87,7 +87,7 @@ teardown() {
   echo export DOKKU_HOST_ROOT="$TMP_ROOT" > $DOKKU_ROOT/.dokkurc/HOST_ROOT
   DOKKU_HOST_ROOT="$TMP_ROOT" deploy_app
 
-  BUILD_CID=$(docker ps -a | grep $TEST_APP | grep /bin/bash | awk '{print $1}')
+  BUILD_CID=$(docker ps -a | grep $TEST_APP | grep /bin/bash | awk '{print $1}' | head -n1)
   run /bin/bash -c "docker inspect --format '{{ .HostConfig.Binds }}' $BUILD_CID | tr -d '[]' | cut -f1 -d:"
   echo "output: $output"
   echo "status: $status"