diff --git a/src/one-body-sample.cc b/src/one-body-sample.cc
index 735471e3e01bf0ff1c7347780f0fbfd24ee08cbb..93bad145d2fdc89e21bc2e4ce64310e9a7d1582b 100644
--- a/src/one-body-sample.cc
+++ b/src/one-body-sample.cc
@@ -260,7 +260,7 @@ int main(int argc, char *argv[]) {
 
           for (size_t i = 0; i < frictionalNodes.size(); ++i) {
             if (frictionalNodes[i][0]) {
-              double const L = parset.get<double>("boundary.friction.ruina.L");
+              auto const L = parset.get<double>("boundary.friction.ruina.L");
               double const unorm = u4_diff[i].two_norm();
 
               // the (logarithmic) steady state corresponding to the current