diff --git a/extra/utils.mk b/extra/utils.mk
index b3af3cc..e81ef60 100644
--- a/extra/utils.mk
+++ b/extra/utils.mk
@@ -8,10 +8,14 @@ format:
 	# Remove trailing whitespaces
 	find ./source -type f -iname '*.[cpp\|c\|h]' -exec sed -i 's/ *$$//' {} \;
 
-preprocess:
+preprocess: preprocess_restore
 	cp ./source/m3_exec.h    ./source/m3_exec.h.bak
 	cp ./source/m3_compile.c ./source/m3_compile.c.bak
 	awk 'BEGIN {RS=""}{gsub(/\\\n/,"\\\n__NL__ ")}1' ./source/m3_exec.h | sponge ./source/m3_exec.h
 	cpp -P ./source/m3_compile.c | sponge ./source/m3_compile.c
 	awk '{gsub(/__NL__/,"\n")}1' ./source/m3_compile.c | sponge ./source/m3_compile.c
 	mv ./source/m3_exec.h.bak ./source/m3_exec.h
+
+preprocess_restore:
+	-mv source/m3_compile.c.bak source/m3_compile.c
+