diff --git a/src/shared/discover-image.c b/src/shared/discover-image.c
index 09bad987ad..8467815efc 100644
--- a/src/shared/discover-image.c
+++ b/src/shared/discover-image.c
@@ -1287,6 +1287,7 @@ int image_read_only(Image *i, bool b) {
                 return -EOPNOTSUPP;
         }
 
+        i->read_only = b;
         return 0;
 }