diff --git a/dumux/discretization/cellcentered/mpfa/interactionvolumedatahandle.hh b/dumux/discretization/cellcentered/mpfa/interactionvolumedatahandle.hh
index 7850e23bd1d2ee2f06fefa92eb13d245725eabca..27b585aa1169e41415b1352fc872f5acf5c90aac 100644
--- a/dumux/discretization/cellcentered/mpfa/interactionvolumedatahandle.hh
+++ b/dumux/discretization/cellcentered/mpfa/interactionvolumedatahandle.hh
@@ -100,7 +100,7 @@ protected:
 
     std::array< std::array<TMatrix, size2>, size1 > T_;             //!< The transmissibility matrix
     std::array< std::array<AMatrix, size2>, size1 > A_;             //!< Inverse of the iv-local system matrix
-    std::array< std::array<CMatrix, size2>, size1 > AB_;            //!< A_ left multiplied to B
+    std::array< std::array<BMatrix, size2>, size1 > AB_;            //!< A_ left multiplied to B
     std::array< std::array<CMatrix, size2>, size1 > CA_;            //!< A_ right multiplied to C
     std::array< std::array<OutsideTij, size2>, size1 > tijOutside_; //!< The transmissibilities for "outside" faces (on surface grids)
 };