diff --git a/lib/radio/nco/ghdl/tb_mix_cordic.make b/lib/radio/nco/ghdl/tb_mix_cordic.make
index 22605b0..fcafc98 100644
--- a/lib/radio/nco/ghdl/tb_mix_cordic.make
+++ b/lib/radio/nco/ghdl/tb_mix_cordic.make
@@ -22,6 +22,7 @@ SRCS += $(LIB_PATH)/radio/nco/src/tb_mix_cordic.vhd
 TARGET := tb_mix_cordic
 ENTITY := tb_mix
 RUN_TIME := 200us
+WAVE_FORMAT := vcd
 
 GHDL_OPTS := -P$(LIB_PATH)/fixed/ieee_proposed/build/fixed_pkg/ieee_proposed
 
diff --git a/lib/radio/nco/ghdl/tb_nco_cordic.make b/lib/radio/nco/ghdl/tb_nco_cordic.make
index 4327194..f77ebd1 100644
--- a/lib/radio/nco/ghdl/tb_nco_cordic.make
+++ b/lib/radio/nco/ghdl/tb_nco_cordic.make
@@ -22,6 +22,7 @@ SRCS += $(LIB_PATH)/radio/nco/src/tb_nco_cordic.vhd
 TARGET := tb_nco_cordic
 ENTITY := tb_nco
 RUN_TIME := 250us
+WAVE_FORMAT := vcd
 
 GHDL_OPTS := -P$(LIB_PATH)/fixed/ieee_proposed/build/fixed_pkg/ieee_proposed
 
diff --git a/lib/radio/nco/ghdl/tb_nco_lut.make b/lib/radio/nco/ghdl/tb_nco_lut.make
index 6baaf53..7293e30 100644
--- a/lib/radio/nco/ghdl/tb_nco_lut.make
+++ b/lib/radio/nco/ghdl/tb_nco_lut.make
@@ -22,6 +22,7 @@ SRCS += $(LIB_PATH)/radio/nco/src/tb_nco_lut.vhd
 TARGET := tb_nco_lut
 ENTITY := tb_nco
 RUN_TIME := 250us
+WAVE_FORMAT := vcd
 
 GHDL_OPTS := -P$(LIB_PATH)/fixed/ieee_proposed/build/fixed_pkg/ieee_proposed