diff --git a/Tests/UnitTests/Core/Vertexing/AdaptiveMultiVertexFinderTests.cpp b/Tests/UnitTests/Core/Vertexing/AdaptiveMultiVertexFinderTests.cpp
index c5016b39d01d6da2503febf1737eb70f125d70e3..983b7a3758004832fafb493a4d5d77301cd66388 100644
--- a/Tests/UnitTests/Core/Vertexing/AdaptiveMultiVertexFinderTests.cpp
+++ b/Tests/UnitTests/Core/Vertexing/AdaptiveMultiVertexFinderTests.cpp
@@ -108,6 +108,9 @@ BOOST_AUTO_TEST_CASE(adaptive_multi_vertex_finder_test) {
   transform.rotate(rotMat);
   transform.translation() = Vector3D(1, 2, 3);
 
+  if (debugMode) {
+    std::cout << "Debug mode." << std::endl;
+  }
   std::cout << "translation: " << transform.translation() << std::endl;
   std::cout << "rot: " << transform.rotation() << std::endl;