diff --git a/qemu/tests/cpuflags.py b/qemu/tests/cpuflags.py
index 886939885cb8807d38849a7b5a2349334c1c166c..f56d78f3cf414a6f8e058da5e8c12f0e2df755fe 100644
--- a/qemu/tests/cpuflags.py
+++ b/qemu/tests/cpuflags.py
@@ -830,7 +830,7 @@ def run(test, params, env):
             dd_session = self.vm.wait_for_login()
             stress_session = self.vm.wait_for_login()
 
-            dd_session.sendline("nohup dd if=/dev/[svh]da of=/tmp/"
+            dd_session.sendline("nohup dd if=$(echo /dev/[svh]da) of=/tmp/"
                                 "stressblock bs=10MB count=100 &")
             cmd = ("nohup %s/cpuflags-test --stress  %s%s &" %
                    (os.path.join(install_path, "src"), smp,