diff --git a/tests/hardware/task_fft/Makefile b/tests/hardware/task_fft/Makefile
index c2938fe..8664ad3 100644
--- a/tests/hardware/task_fft/Makefile
+++ b/tests/hardware/task_fft/Makefile
@@ -11,6 +11,8 @@ verilog_srcs = \
 vhdl_srcs = \
     ../../../hardware/system/reg32.vhd \
     ../../../hardware/system/avalon_slave.vhd \
+    ../test_utility.vhd \
+    ../test_avalon_slave.vhd \
     ../../hardware/test_data_channel.vhd \
     ../../../hardware/system/avalon_slave_transitions.vhd \
     ../../../hardware/system/task.vhd \