diff --git a/dune/tectonic/data-structures/friction/localfriction.hh b/dune/tectonic/data-structures/friction/localfriction.hh
index 7a477b5c10adeebaa19526d1c9739d1766e0b475..e6014373868e7186603e2cdc8318a41f09e33df2 100644
--- a/dune/tectonic/data-structures/friction/localfriction.hh
+++ b/dune/tectonic/data-structures/friction/localfriction.hh
@@ -61,9 +61,10 @@ class WrappedScalarFriction : public LocalFriction<dimension> {
 
   double regularity(VectorType const &x) const override {
     auto tangential_x = removeNormal(x);
-    double const xnorm = tangential_x.two_norm();
-    if (xnorm < 0.0)
-      return std::numeric_limits<double>::infinity();
+    double xnorm = tangential_x.two_norm();
+    if (xnorm < 0.0) {
+        return std::numeric_limits<double>::infinity();
+    }
 
     return func_.regularity(xnorm);
   }