diff --git a/tests/test_raid.py b/tests/test_raid.py
index 3bc701b8fc2788104f9bb0136262348b998094d8..6a946221eda272234bd0b9cd8227ba74de2d77b1 100755
--- a/tests/test_raid.py
+++ b/tests/test_raid.py
@@ -24,7 +24,7 @@ def print_green(string):
 
 
 def check_raid(dev):
-    cmd = 'mdadm -D %s' % dev
+    cmd = '/sbin/mdadm -D %s' % dev
     status, output = subprocess.getstatusoutput(cmd)
     if status != 0:
         print_red('The mdadm command on %s failed:' % dev)