diff --git a/dune/tectonic/myblockproblem.hh b/dune/tectonic/myblockproblem.hh
index fb070099f06d2849892700fe30c1586fba6c278c..fa727174c3b4f9dacd0efc35ed19cdc55e1e927c 100644
--- a/dune/tectonic/myblockproblem.hh
+++ b/dune/tectonic/myblockproblem.hh
@@ -131,11 +131,9 @@ template <class MyConvexProblemTypeTEMPLATE> class MyBlockProblem {
 
     Interval<double> D;
     psi.subDiff(0, D);
-    if (D[1] > 0) {
-      // NOTE: Numerical instability can actually get us here
-      assert(std::abs(D[1]) < 1e-12);
+    // NOTE: Numerical instability can actually get us here
+    if (D[1] > 0)
       return 0;
-    }
 
     int bisectionsteps = 0;
     Bisection bisection(0.0, 1.0, 1e-12, true, 0);                      // TODO