diff --git a/tests/functional/test_ppc64_hv.py b/tests/functional/test_ppc64_hv.py
index 1a6e4b6d07..312248bbfe 100755
--- a/tests/functional/test_ppc64_hv.py
+++ b/tests/functional/test_ppc64_hv.py
@@ -99,7 +99,8 @@ class HypervisorTest(QemuSystemTest):
         self.vm.add_args("-kernel", self.vmlinuz)
         self.vm.add_args("-initrd", self.initramfs)
         self.vm.add_args("-smp", "4", "-m", "2g")
-        self.vm.add_args("-drive", f"file={self.iso_path},format=raw,if=none,id=drive0")
+        self.vm.add_args("-drive", f"file={self.iso_path},format=raw,if=none,"
+                                    "id=drive0,read-only=true")
 
         self.vm.launch()
         wait_for_console_pattern(self, 'Welcome to Alpine Linux 3.18')
diff --git a/tests/functional/test_ppc_40p.py b/tests/functional/test_ppc_40p.py
index c64e876c1f..67bcdae53a 100755
--- a/tests/functional/test_ppc_40p.py
+++ b/tests/functional/test_ppc_40p.py
@@ -46,7 +46,8 @@ class IbmPrep40pMachine(QemuSystemTest):
 
         self.vm.set_console()
         self.vm.add_args('-bios', bios_path,
-                         '-fda', drive_path)
+                         '-drive',
+                         f"file={drive_path},format=raw,if=floppy,read-only=true")
         self.vm.launch()
         os_banner = 'NetBSD 4.0 (GENERIC) #0: Sun Dec 16 00:49:40 PST 2007'
         wait_for_console_pattern(self, os_banner)