diff --git a/passes/techmap/Makefile.inc b/passes/techmap/Makefile.inc
index ae1ebbb56..85d580ce8 100644
--- a/passes/techmap/Makefile.inc
+++ b/passes/techmap/Makefile.inc
@@ -11,8 +11,9 @@ GENFILES += passes/techmap/stdcells.inc
 
 passes/techmap/stdcells.inc: techlibs/common/stdcells.v
 	echo "// autogenerated from $<" > $@.new
-	od -v -td1 -w1 $< | awk 'BEGIN { print "static char stdcells_code[] = {"; } $$2 != "" { print $$2 ","; } \
-			END { print 0 "};"; }' | fmt >> $@.new
+	echo "static char stdcells_code[] = {" >> $@.new
+	od -v -td1 -An $< | $(SED) -e 's/[0-9][0-9]*/&,/g' >> $@.new
+	echo "0};" >> $@.new
 	mv $@.new $@
 
 passes/techmap/techmap.o: passes/techmap/stdcells.inc