diff --git a/fish/test-inspect.sh b/fish/test-inspect.sh
index 5ab8e61a9..342504ce6 100755
--- a/fish/test-inspect.sh
+++ b/fish/test-inspect.sh
@@ -18,4 +18,4 @@
 
 set -e
 
-$VG guestfish -a ../test-data/phony-guests/fedora.img -i exit
+$VG guestfish --ro -a ../test-data/phony-guests/fedora.img -i exit
diff --git a/fish/test-run.sh b/fish/test-run.sh
index aa137fc41..9b5f13f0f 100755
--- a/fish/test-run.sh
+++ b/fish/test-run.sh
@@ -18,4 +18,4 @@
 
 set -e
 
-$VG guestfish -a ../test-data/phony-guests/fedora.img run
+$VG guestfish --ro -a ../test-data/phony-guests/fedora.img run