diff --git a/src/Makefile.am b/src/Makefile.am
index e6ad142e429c19a7b47cb171ba1f000761c373bf..65f093b014ed16577c4f0f36bf4636da223e6929 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -42,8 +42,8 @@ include_HEADERS = space.h runner.h queue.h task.h lock.h cell.h part.h const.h \
 AM_SOURCES = space.c runner.c queue.c task.c cell.c engine.c \
     serial_io.c timers.c debug.c scheduler.c proxy.c parallel_io.c \
     units.c common_io.c single_io.c multipole.c version.c map.c \
-    kernel.c tools.c part.c partition.c clocks.c parser.c potentials.c \
-    physical_constants.c
+    kernel_hydro.c kernel_gravity.c tools.c part.c partition.c clocks.c parser.c \
+    physical_constants.c potentials.c
 
 # Include files for distribution, not installation.
 nobase_noinst_HEADERS = approx_math.h atomic.h cycle.h error.h inline.h kernel_hydro.h kernel_gravity.h \