diff --git a/tdc/Makefile b/tdc/Makefile
index f08fb8c..8b7629c 100644
--- a/tdc/Makefile
+++ b/tdc/Makefile
@@ -21,7 +21,8 @@ all: $(SIM_TARGET)  $(BIN_TARGET)
 $(BUILD_DIR)/Vtop.cc: $(RTL_SRC)
 	@echo "Running verilator"
 	@mkdir -p $(BUILD_DIR)
-	@$(VERILATOR) --trace -Wall -GWIDTH=10 -cc $^ --top-module top --Mdir $(BUILD_DIR)
+	@$(VERILATOR) --trace -Wall -GWIDTH=10 -cc $^ --top-module top\
+		--Mdir $(BUILD_DIR) --timescale-override 10ns/1ns
 
 $(BUILD_DIR)/Vtop__ALL.a: $(BUILD_DIR)/Vtop.cc
 	@make --no-print-directory -C $(BUILD_DIR) -f Vtop.mk