diff --git a/vsim/Makefrag b/vsim/Makefrag
index 3abb2b4e..a0e1c3de 100644
--- a/vsim/Makefrag
+++ b/vsim/Makefrag
@@ -7,7 +7,8 @@
 bb_vsrcs = $(base_dir)/vsrc/DebugTransportModuleJtag.v \
 	$(base_dir)/vsrc/jtag_vpi.v \
 	$(base_dir)/vsrc/AsyncMailbox.v \
-	$(base_dir)/vsrc/AsyncResetReg.v
+	$(base_dir)/vsrc/AsyncResetReg.v \
+	$(base_dir)/vsrc/ClockDivider.v \
 
 sim_vsrcs = \
 	$(generated_dir)/$(MODEL).$(CONFIG).v \