diff --git a/compose.yaml b/compose.yaml
index 90f386dc6..2ecf7a530 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -3,8 +3,8 @@ services:
     image: docker.io/library/perl:stable
     pull_policy: if_not_present
     volumes:
-      - ./utils/makehelp.pl:/mnt/utils/makehelp.pl
-      - ./Makefile:/tmp/Makefile
+      - ./utils/makehelp.pl:/mnt/utils/makehelp.pl:ro
+      - ./Makefile:/tmp/Makefile:ro
     command: /mnt/utils/makehelp.pl /tmp/Makefile
 
   frontend: