diff --git a/dune/tectonic/frictionpotential.hh b/dune/tectonic/frictionpotential.hh
index ead152b36a009dd2f183f39741d66b49c11a1201..f4baa6245589f5a0587b628b74aa29347622f475 100644
--- a/dune/tectonic/frictionpotential.hh
+++ b/dune/tectonic/frictionpotential.hh
@@ -30,8 +30,8 @@ class FrictionPotentialWrapper {
 // 0                       otherwise
 class FrictionPotential : public FrictionPotentialWrapper {
 public:
-  FrictionPotential(double coefficient, FrictionData const &fd)
-      : fd(fd), weightTimesNormalStress(coefficient * (-fd.normalStress)) {}
+  FrictionPotential(double coefficient, FrictionData const &_fd)
+      : fd(_fd), weightTimesNormalStress(coefficient * (-fd.normalStress)) {}
 
   // log(V/V_m) if V >= V_0
   // 0          otherwise