diff --git a/passes/opt/opt_rmdff.cc b/passes/opt/opt_rmdff.cc
index c7e92ddc1..5f52bb8d8 100644
--- a/passes/opt/opt_rmdff.cc
+++ b/passes/opt/opt_rmdff.cc
@@ -83,7 +83,7 @@ bool handle_dff(RTLIL::Module *mod, RTLIL::Cell *dff)
 		val_init.bits.push_back(bit.wire == NULL ? bit.data : RTLIL::State::Sx);
 	}
 
-	if (dff->type == "$dff" && mux_drivers.has(sig_d)) {
+	if (dff->type == "$dff" && mux_drivers.has(sig_d) && !has_init) {
 		std::set<RTLIL::Cell*> muxes;
 		mux_drivers.find(sig_d, muxes);
 		for (auto mux : muxes) {