diff --git a/lib/radio/decimator/CIC/ghdl/tb_cic_decim_pipe.make b/lib/radio/decimator/CIC/ghdl/tb_cic_decim_pipe.make
index 0d0f5a8..3a0c99c 100644
--- a/lib/radio/decimator/CIC/ghdl/tb_cic_decim_pipe.make
+++ b/lib/radio/decimator/CIC/ghdl/tb_cic_decim_pipe.make
@@ -10,6 +10,7 @@ SRCS += $(LIB_PATH)/radio/decimator/CIC/src/tb_cic_decim_pipe.vhd
 TARGET := tb_cic_decim_pipe
 ENTITY := tb_cic_decim_pipe
 RUN_TIME := 75us
+WAVE_FORMAT := vcd
 
 GHDL_OPTS := -P$(LIB_PATH)/fixed/ieee_proposed/build/fixed_pkg/ieee_proposed