diff --git a/dune/solvers/iterationsteps/projectedblockgsstep.cc b/dune/solvers/iterationsteps/projectedblockgsstep.cc
index 6ac1b03181106a81c75e8b8fad79b9252800095a..8de381085d44af1754686b96d40a652e1ed23381 100644
--- a/dune/solvers/iterationsteps/projectedblockgsstep.cc
+++ b/dune/solvers/iterationsteps/projectedblockgsstep.cc
@@ -33,7 +33,7 @@ void ProjectedBlockGSStep<OperatorType, DiscFuncType>::iterate()
             continue;
 
         VectorBlock r;
-        residual(i, r);
+        this->residual(i, r);
 
         // Compute x_i += A_{i,i}^{-1} r[i] 
         VectorBlock v;