diff --git a/src/Makefile.am b/src/Makefile.am
index 5859c59d9ddbc7e701145c40f8f0a35b92a075c3..f57246bb588914280b7812478ad4b23a3ecd1f9c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -44,7 +44,7 @@ include_HEADERS = space.h runner.h queue.h task.h lock.h cell.h part.h const.h \
     common_io.h single_io.h multipole.h map.h tools.h partition.h clocks.h parser.h \
     physical_constants.h physical_constants_cgs.h potential.h version.h \
     hydro_properties.h riemann.h threadpool.h cooling.h cooling_struct.h sourceterms.h \
-    sourceterms_struct.h
+    sourceterms_struct.h cbrt.h
 
 
 # Common source files
@@ -56,7 +56,7 @@ AM_SOURCES = space.c runner.c queue.c task.c cell.c engine.c \
     runner_doiact_fft.c threadpool.c cooling.c sourceterms.c
 
 # Include files for distribution, not installation.
-nobase_noinst_HEADERS = align.h approx_math.h atomic.h cycle.h error.h inline.h kernel_hydro.h kernel_gravity.h \
+nobase_noinst_HEADERS = align.h approx_math.h atomic.h cbrt.h cycle.h error.h inline.h kernel_hydro.h kernel_gravity.h \
 		 kernel_long_gravity.h vector.h runner_doiact.h runner_doiact_grav.h runner_doiact_fft.h \
                  units.h intrinsics.h minmax.h kick.h timestep.h drift.h adiabatic_index.h io_properties.h \
 		 dimension.h equation_of_state.h \