diff --git a/os_brick/exception.py b/os_brick/exception.py
index 39d1c06ac..fcf708748 100644
--- a/os_brick/exception.py
+++ b/os_brick/exception.py
@@ -128,3 +128,7 @@ class VolumeGroupNotFound(BrickException):
 
 class VolumeGroupCreationFailed(BrickException):
     message = _("Failed to create Volume Group: %(vg_name)s")
+
+
+class CommandExecutionFailed(BrickException):
+    message = _("Failed to execute command %(cmd)s")
diff --git a/os_brick/initiator/linuxscsi.py b/os_brick/initiator/linuxscsi.py
index d64db9d03..ed1035528 100644
--- a/os_brick/initiator/linuxscsi.py
+++ b/os_brick/initiator/linuxscsi.py
@@ -266,7 +266,8 @@ class LinuxSCSI(executor.Executor):
         except putils.ProcessExecutionError as exc:
             LOG.warning(_LW("multipath call failed exit %(code)s"),
                         {'code': exc.exit_code})
-            return None
+            raise exception.CommandExecutionFailed(
+                cmd='multipath -l %s' % device)
 
         if out:
             lines = out.strip()