diff --git a/common.mk b/common.mk
index 5e0e2fcd6a..f525b526a8 100644
--- a/common.mk
+++ b/common.mk
@@ -28,7 +28,6 @@ EXTRA_SIM_CXXFLAGS   ?=
 EXTRA_SIM_LDFLAGS    ?=
 EXTRA_SIM_SOURCES    ?=
 EXTRA_SIM_REQS       ?=
-ENABLE_CUSTOM_FIRRTL_PASS += $(ENABLE_YOSYS_FLOW)
 
 ifneq ($(ASPECTS), )
 	comma = ,