diff --git a/common.mk b/common.mk
index 6cef7067..a0f3e6ac 100644
--- a/common.mk
+++ b/common.mk
@@ -209,6 +209,7 @@ $(SFC_MFC_TARGETS) &: $(FIRRTL_FILE) $(FINAL_ANNO_FILE) $(MFC_LOWERING_OPTIONS)
 		--split-verilog \
 		-o $(GEN_COLLATERAL_DIR) \
 		$(FIRRTL_FILE)
+	$(SED) -i 's/.*/& /' $(MFC_SMEMS_CONF) # need trailing space for SFC macrocompiler
 	touch $(MFC_BB_MODS_FILELIST) # if there are no BB's then the file might not be generated, instead always generate it
 # DOC include end: FirrtlCompiler