diff --git a/pc-bios/meson.build b/pc-bios/meson.build
index e67fa433a1be3db39bd9972201700f8b828e1dbd..b158a9504121e775385d4d73dc302c527872a0de 100644
--- a/pc-bios/meson.build
+++ b/pc-bios/meson.build
@@ -102,7 +102,7 @@ foreach f : [
 endforeach
 
 if get_option('install_blobs')
-  install_data(blobs, install_dir: qemu_datadir)
+  install_data(blobs, install_dir: qemu_datadir, install_mode: 'rw-r--r--')
 endif
 
 subdir('descriptors')