diff --git a/antsibull-nox.toml b/antsibull-nox.toml
index e58ebde7..0b68d25b 100644
--- a/antsibull-nox.toml
+++ b/antsibull-nox.toml
@@ -37,6 +37,7 @@ run_no_unwanted_files = true
 no_unwanted_files_module_extensions = [".py"]
 no_unwanted_files_yaml_extensions = [".yml"]
 run_action_groups = true
+run_no_trailing_whitespace = true
 
 [[sessions.extra_checks.action_groups_config]]
 name = "docker"
diff --git a/tests/integration/targets/inventory_docker_machine/docker-machine b/tests/integration/targets/inventory_docker_machine/docker-machine
index aad9e5fe..40ef76e7 100644
--- a/tests/integration/targets/inventory_docker_machine/docker-machine
+++ b/tests/integration/targets/inventory_docker_machine/docker-machine
@@ -7,7 +7,7 @@
 
 [ "$MOCK_ERROR_IN" == "$1" ] && echo >&2 "Mock Docker Machine error" && exit 1
 case $1 in
-    env)        
+    env)
         cat <<'EOF'
 export DOCKER_TLS_VERIFY="1"
 export DOCKER_HOST="tcp://134.209.204.160:2376"