diff --git a/axi/tb/axil_reg_cocotb/Makefile b/axi/tb/axil_reg_cocotb/Makefile
index 3798194..5d37d39 100644
--- a/axi/tb/axil_reg_cocotb/Makefile
+++ b/axi/tb/axil_reg_cocotb/Makefile
@@ -28,6 +28,7 @@ EXTRA_ARGS += --trace
 EXTRA_ARGS += --trace-structs
 EXTRA_ARGS += --public-flat-rw
 EXTRA_ARGS += -Wno-fatal
+EXTRA_ARGS += --timing
 endif
 
 include $(shell cocotb-config --makefiles)/Makefile.sim