diff --git a/src/Makefile.am b/src/Makefile.am
index 3cf4bfddce8a94b7fdea12e3c9b01a26c8b97cff..97eefa55dc6af5baa17dc490b694a3c4cefdba2a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -416,9 +416,9 @@ nobase_noinst_HEADERS += pressure_floor/GEAR/pressure_floor.h pressure_floor/non
 nobase_noinst_HEADERS += pressure_floor/GEAR/pressure_floor_iact.h pressure_floor/none/pressure_floor_iact.h 
 nobase_noinst_HEADERS += pressure_floor/GEAR/pressure_floor_struct.h pressure_floor/none/pressure_floor_struct.h 
 nobase_noinst_HEADERS += sink/Default/sink.h sink/Default/sink_io.h sink/Default/sink_part.h sink/Default/sink_properties.h 
-nobase_noinst_HEADERS += sink/Default/sink_iact.h
+nobase_noinst_HEADERS += sink/Default/sink_iact.h sink/Default/sink_struct.h
 nobase_noinst_HEADERS += sink/GEAR/sink.h sink/GEAR/sink_io.h sink/GEAR/sink_part.h sink/GEAR/sink_properties.h 
-nobase_noinst_HEADERS += sink/GEAR/sink_iact.h
+nobase_noinst_HEADERS += sink/GEAR/sink_iact.h sink/GEAR/sink_struct.h
 nobase_noinst_HEADERS += neutrino.h neutrino_properties.h neutrino_io.h
 nobase_noinst_HEADERS += neutrino/Default/neutrino.h neutrino/Default/relativity.h neutrino/Default/fermi_dirac.h
 nobase_noinst_HEADERS += neutrino/Default/neutrino_properties.h neutrino/Default/neutrino_io.h