diff --git a/src/inspect-fs.c b/src/inspect-fs.c
index 0b1ba926b..fed77614c 100644
--- a/src/inspect-fs.c
+++ b/src/inspect-fs.c
@@ -112,6 +112,7 @@ guestfs___check_for_filesystem_on (guestfs_h *g, const char *device,
     if (extend_fses (g) == -1)
       return -1;
     fs = &g->fses[g->nr_fses-1];
+    fs->device = safe_strdup (g, device);
     return 0;
   }