diff --git a/Modules/Core/Common/test/itkMultiThreaderExceptionsTest.cxx b/Modules/Core/Common/test/itkMultiThreaderExceptionsTest.cxx
index 530ba467b7e..ac25ff69f75 100644
--- a/Modules/Core/Common/test/itkMultiThreaderExceptionsTest.cxx
+++ b/Modules/Core/Common/test/itkMultiThreaderExceptionsTest.cxx
@@ -83,10 +83,13 @@ itkMultiThreaderExceptionsTest(int, char *[])
 
   using OutputImageType = itk::Image<OutputPixelType, Dimension>;
 
-  const std::set<ThreaderEnum> threadersToTest = { ThreaderEnum::Platform, ThreaderEnum::Pool };
+  const std::set<ThreaderEnum> threadersToTest = {
+    ThreaderEnum::Platform,
+    ThreaderEnum::Pool,
 #ifdef ITK_USE_TBB
-  threadersToTest.insert(ThreaderEnum::TBB);
+    ThreaderEnum::TBB,
 #endif // ITK_USE_TBB
+  };
   for (auto thType : threadersToTest)
   {
     itk::MultiThreaderBase::SetGlobalDefaultThreader(thType);
diff --git a/Modules/Core/Common/test/itkMultiThreaderTypeFromEnvironmentTest.cxx b/Modules/Core/Common/test/itkMultiThreaderTypeFromEnvironmentTest.cxx
index cdcbbe1e7c1..eca631127e5 100644
--- a/Modules/Core/Common/test/itkMultiThreaderTypeFromEnvironmentTest.cxx
+++ b/Modules/Core/Common/test/itkMultiThreaderTypeFromEnvironmentTest.cxx
@@ -67,10 +67,13 @@ itkMultiThreaderTypeFromEnvironmentTest(int argc, char * argv[])
   success &= checkThreaderByName(expectedThreaderType);
 
   // check that developer's choice for default is respected
-  const std::set<ThreaderEnum> threadersToTest = { ThreaderEnum::Platform, ThreaderEnum::Pool };
+  const std::set<ThreaderEnum> threadersToTest = {
+    ThreaderEnum::Platform,
+    ThreaderEnum::Pool,
 #ifdef ITK_USE_TBB
-  threadersToTest.insert(ThreaderEnum::TBB);
+    ThreaderEnum::TBB,
 #endif // ITK_USE_TBB
+  };
   for (auto thType : threadersToTest)
   {
     itk::MultiThreaderBase::SetGlobalDefaultThreader(thType);