diff --git a/daemon/lvm.c b/daemon/lvm.c
index 093e68258..d3892fe77 100644
--- a/daemon/lvm.c
+++ b/daemon/lvm.c
@@ -863,9 +863,11 @@ lv_canonical (const char *device, char **ret)
 
 /* Test if a device is a logical volume (RHBZ#619793). */
 int
-do_is_lv (const char *device)
+do_is_lv (const mountable_t *mountable)
 {
-  return lv_canonical (device, NULL);
+  if (mountable->type != MOUNTABLE_DEVICE)
+    return 0;
+  return lv_canonical (mountable->device, NULL);
 }
 
 /* Return canonical name of LV to caller (RHBZ#638899). */
diff --git a/generator/actions.ml b/generator/actions.ml
index 78d0a7359..25108a2cd 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -9103,7 +9103,7 @@ I<other> keys." };
 
   { defaults with
     name = "is_lv"; added = (1, 5, 3);
-    style = RBool "lvflag", [Device "device"], [];
+    style = RBool "lvflag", [Mountable "mountable"], [];
     proc_nr = Some 264;
     tests = [
       InitBasicFSonLVM, Always, TestResultTrue (
@@ -9111,9 +9111,9 @@ I<other> keys." };
       InitBasicFSonLVM, Always, TestResultFalse (
         [["is_lv"; "/dev/sda1"]]), []
     ];
-    shortdesc = "test if device is a logical volume";
+    shortdesc = "test if mountable is a logical volume";
     longdesc = "\
-This command tests whether C<device> is a logical volume, and
+This command tests whether C<mountable> is a logical volume, and
 returns true iff this is the case." };
 
   { defaults with