diff --git a/AMDiS/src/solver/PetscTypes.h b/AMDiS/src/solver/PetscTypes.h
index b1c894ff3e1a21c35b1dd442da04f304bb011226..4cad77bcfd28674cf099cf61280b16f1ff9864f8 100644
--- a/AMDiS/src/solver/PetscTypes.h
+++ b/AMDiS/src/solver/PetscTypes.h
@@ -26,7 +26,9 @@
 #include <petsc.h>
 #include <petscmat.h> 
 #include <petscvec.h>
- 
+#include <map>
+#include <string>
+
 namespace AMDiS {
   
   /// pair of nested matrices and blockmatrix