diff --git a/dumux/discretization/box/boxgeometryhelper.hh b/dumux/discretization/box/boxgeometryhelper.hh
index f70785c255d14532ad98f27dfdf9915741a18e86..e9e35a8cc342ff25344c6b2b67f2434fbc9694d5 100644
--- a/dumux/discretization/box/boxgeometryhelper.hh
+++ b/dumux/discretization/box/boxgeometryhelper.hh
@@ -467,7 +467,7 @@ public:
             static const std::uint8_t map[6][4] =
             {
                 {eo+0, fo+0, fo+1,    0},
-                {fo+1, eo+1,    0, fo+2},
+                {fo+0, eo+1,    0, fo+2},
                 {eo+2, fo+0, fo+3,    0},
                 {fo+2, eo+3,    0, fo+1},
                 {fo+3,    0, eo+4, fo+1},