diff --git a/scripts/protopackage.sh b/scripts/protopackage.sh
index 5eace2752..688852573 100755
--- a/scripts/protopackage.sh
+++ b/scripts/protopackage.sh
@@ -17,7 +17,7 @@ fi
 
 
 if ! grep -q 'option\s\+go_package\s\+=\s\+.*;' $FNAME; then
-	sed -i "s/\(package tendermint.*\)/\1\n\noption go_package = \"$MODNAME\/$PACKAGE\";/g" $FNAME
+	sed -i "" "s/\(package tendermint.*\)/\1\n\noption go_package = \"$MODNAME\/$PACKAGE\";/g" $FNAME
 else
-	sed -i "s/option\s\+go_package\s\+=\s\+.*;/option go_package = \"$MODNAME\/$PACKAGE\";/g" $FNAME
+	sed -i "" "s/option\s\+go_package\s\+=\s\+.*;/option go_package = \"$MODNAME\/$PACKAGE\";/g" $FNAME
 fi