diff --git a/brain/neuron/soma.cpp b/brain/neuron/soma.cpp
index 91b377a0..b097bcaf 100644
--- a/brain/neuron/soma.cpp
+++ b/brain/neuron/soma.cpp
@@ -35,7 +35,7 @@ glm::vec3 _computeCentroid(const Vector4fs& points)
     centroid /= static_cast<float>(points.size());
     return centroid;
 }
-}
+} // namespace
 
 Soma::Soma(Morphology::ImplPtr morphology)
     : _morphology(morphology)
@@ -69,7 +69,7 @@ float Soma::getMeanRadius() const
 
     const auto centroid = _computeCentroid(points);
     float radius = 0;
-    for (const auto point : points)
+    for (const auto& point : points)
         radius += glm::length(glm::vec3(point) - centroid);
     return radius /= float(points.size());
 }
@@ -105,5 +105,5 @@ Sections Soma::getChildren() const
         result.push_back(Section(id, _morphology));
     return result;
 }
-}
-}
+} // namespace neuron
+} // namespace brain
diff --git a/brion/plugin/compartmentReportHDF5Sonata.cpp b/brion/plugin/compartmentReportHDF5Sonata.cpp
index bd032fb3..cbb87491 100644
--- a/brion/plugin/compartmentReportHDF5Sonata.cpp
+++ b/brion/plugin/compartmentReportHDF5Sonata.cpp
@@ -422,7 +422,7 @@ bool CompartmentReportHDF5Sonata::_loadFrame(const size_t frameNumber,
     // Reading slice by slice and processing all cells contained in a given
     // slice
     size_t targetOffset = 0;
-    for (const auto interval : intervals)
+    for (const auto& interval : intervals)
     {
         const auto sourceOffset = interval.first;
         const auto count = interval.second - sourceOffset;
diff --git a/brion/simulationConfig.cpp b/brion/simulationConfig.cpp
index f8aab742..f2a9a422 100644
--- a/brion/simulationConfig.cpp
+++ b/brion/simulationConfig.cpp
@@ -149,7 +149,7 @@ std::string SimulationConfig::getSpikesFilepath() const
 Strings SimulationConfig::getCompartmentReportNames() const
 {
     Strings names;
-    for (const auto item : _impl->reportFilepaths)
+    for (const auto& item : _impl->reportFilepaths)
         names.push_back(item.first);
     return names;
 }