diff --git a/test/.docker/Dockerfile b/test/.docker/Dockerfile
index b79acda3e92628ec0d6628539997736aa656a20d..1634ab9f5d2b8aa40c22240d6e88ae66d2eb7c48 100644
--- a/test/.docker/Dockerfile
+++ b/test/.docker/Dockerfile
@@ -9,4 +9,4 @@ RUN apt-get install -y python3-pip
 COPY doc/requirements.txt requirements.txt
 RUN pip3 install -r requirements.txt
 
-RUN apt-get install -y clang-format
+RUN apt-get install -y clang-format-11
diff --git a/test/test_connection.c b/test/test_connection.c
index 2fc5d53f15ee420505a75f6b0e033eb5a04384d3..8ee7520bfb3537d31e5be8ca722d94dc630cae26 100644
--- a/test/test_connection.c
+++ b/test/test_connection.c
@@ -10,7 +10,7 @@ static void test_configure_connection(void **state) {
 
 int main() {
   const struct CMUnitTest tests[] = {
-    cmocka_unit_test(test_configure_connection),
+      cmocka_unit_test(test_configure_connection),
   };
 
   return cmocka_run_group_tests(tests, NULL, NULL);