diff --git a/src/slic3r/GUI/Jobs/ThreadSafeQueue.hpp b/src/slic3r/GUI/Jobs/ThreadSafeQueue.hpp
index 14714b2eac..94c63a0fd5 100644
--- a/src/slic3r/GUI/Jobs/ThreadSafeQueue.hpp
+++ b/src/slic3r/GUI/Jobs/ThreadSafeQueue.hpp
@@ -118,7 +118,8 @@ public:
     void clear()
     {
         std::lock_guard lk{m_mutex};
-        while (!m_queue.empty()) m_queue.pop();
+        while (!m_queue.empty())
+            m_queue.pop();
     }
 };
 
diff --git a/tests/slic3rutils/CMakeLists.txt b/tests/slic3rutils/CMakeLists.txt
index ac506e9756..f207916f67 100644
--- a/tests/slic3rutils/CMakeLists.txt
+++ b/tests/slic3rutils/CMakeLists.txt
@@ -18,6 +18,6 @@ if (WIN32)
 endif()
 
 # catch_discover_tests(${_TEST_NAME}_tests TEST_PREFIX "${_TEST_NAME}: ")
-set(_catch_args "exclude:[NotWorking]")
+set(_catch_args "exclude:[NotWorking];-s")
 list(APPEND _catch_args "${CATCH_EXTRA_ARGS}")
 add_test(${_TEST_NAME}_tests ${_TEST_NAME}_tests ${_catch_args})
diff --git a/tests/slic3rutils/slic3r_jobs_tests.cpp b/tests/slic3rutils/slic3r_jobs_tests.cpp
index b0d01d2edd..2888ef1a6e 100644
--- a/tests/slic3rutils/slic3r_jobs_tests.cpp
+++ b/tests/slic3rutils/slic3r_jobs_tests.cpp
@@ -20,6 +20,14 @@ struct Progress: Slic3r::ProgressIndicator {
 
 using TestClasses = std::tuple< Slic3r::GUI::UIThreadWorker, Slic3r::GUI::BoostThreadWorker >;
 
+TEMPLATE_LIST_TEST_CASE("Empty worker should not block when queried for idle", "[Jobs]", TestClasses) {
+    TestType worker{std::make_unique<Progress>()};
+
+    worker.wait_for_idle();
+
+    REQUIRE(worker.is_idle());
+}
+
 TEMPLATE_LIST_TEST_CASE("Empty worker should not do anything", "[Jobs]", TestClasses) {
     TestType worker{std::make_unique<Progress>()};