fix warning

git-svn-id: https://svn.dealii.org/trunk@28980 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/examples/step-17/step-17.cc b/deal.II/examples/step-17/step-17.cc
index f90d693cab8fadb55256e265d5ea4e0344d337d7..34cfece8430469a1e1ee375571d2929dedfd8d34 100644 (file)
--- a/deal.II/examples/step-17/step-17.cc
+++ b/deal.II/examples/step-17/step-17.cc
@@ -508,7 +508,7 @@ namespace Step17
         }
 
     // Now compress the vector and the system matrix:
-    system_matrix.compress();
+    system_matrix.compress(VectorOperation::add);
     system_rhs.compress(VectorOperation::add);
 
     // The global matrix and right hand side vectors have now been