diff --git a/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp b/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp
index 47e27fd9893..28832a15679 100644
--- a/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp
+++ b/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp
@@ -654,8 +654,7 @@ class CombinatorialKalmanFilter {
         // The surface could be either sensitive or passive
         bool isSensitive = (surface->associatedDetectorElement() != nullptr);
         bool isMaterial = (surface->surfaceMaterial() != nullptr);
-        std::string type = isSensitive ? "sensitive" : "passive";
-        ACTS_VERBOSE("Detected " << type
+        ACTS_VERBOSE("Detected " << (isSensitive ? "sensitive" : "passive")
                                  << " surface: " << surface->geometryId());
         if (isSensitive) {
           // Increment of number of passed sensitive surfaces