diff --git a/grid/alu3dgrid/Makefile.am b/grid/alu3dgrid/Makefile.am
index 4b5c5b0cf66295872f8e30dc482eb3d917c9ddf1..ce9b3a0ac666119bf0c8e6f00528bd0b4630f5a6 100644
--- a/grid/alu3dgrid/Makefile.am
+++ b/grid/alu3dgrid/Makefile.am
@@ -1,6 +1,6 @@
 alu3dgriddir = $(includedir)/dune/grid/alu3dgrid/
 alu3dgrid_HEADERS = alu3dgrid.cc alu3dinclude.hh alu3dgridcomm.hh \
   datahandle.hh leafwalk.hh alumemory.hh myautoptr.hh alu3dgeometry.cc \
-  alu3dgeometry.hh
+  alu3dgeometry.hh alu3dmappings.cc alu3dmappings.hh
 
 include $(top_srcdir)/am/sourcescheck