diff --git a/lib/radio/ddc/ghdl/tb_syn_ddc.make b/lib/radio/ddc/ghdl/tb_syn_ddc.make
index 6309f97..9b9f74b 100644
--- a/lib/radio/ddc/ghdl/tb_syn_ddc.make
+++ b/lib/radio/ddc/ghdl/tb_syn_ddc.make
@@ -23,7 +23,7 @@ SRCS += $(LIB_PATH)/radio/ddc/src/tb_syn_ddc.vhd
 TARGET := tb_syn_ddc
 ENTITY := tb_syn_ddc
 WITH_VCD := y
-RUN_TIME := 500us
+RUN_TIME := 100us
 
 GHDL_OPTS := -P$(LIB_PATH)/fixed/ieee_proposed/build/fixed_pkg/ieee_proposed