diff --git a/src/app/rpmostree-libbuiltin.c b/src/app/rpmostree-libbuiltin.c
index 2fa573f3..245f8b98 100644
--- a/src/app/rpmostree-libbuiltin.c
+++ b/src/app/rpmostree-libbuiltin.c
@@ -56,7 +56,7 @@ rpmostree_print_treepkg_diff (OstreeSysroot    *sysroot,
       if (!ostree_sysroot_get_repo (sysroot, &repo, cancellable, error))
         goto out;
       
-      if (!rpm_ostree_db_diff (repo, from_rev, to_rev, NULL,
+      if (!rpm_ostree_db_diff (repo, from_rev, to_rev,
                                &removed, &added, &modified_old, &modified_new,
                                cancellable, error))
         goto out;
diff --git a/src/lib/rpmostree-db.c b/src/lib/rpmostree-db.c
index 9895a6d1..e716f3f4 100644
--- a/src/lib/rpmostree-db.c
+++ b/src/lib/rpmostree-db.c
@@ -140,7 +140,6 @@ rpm_ostree_db_query_all (OstreeRepo                *repo,
  * @repo: An OSTree repository
  * @orig_ref: Original ref (branch or commit)
  * @new_ref: New ref (branch or commit)
- * @query: (allow-none): A query, currently must be %NULL
  * @out_removed: (out) (transfer container) (element-type RpmOstreePackage): Return location for removed packages
  * @out_added: (out) (transfer container) (element-type RpmOstreePackage): Return location for added packages
  * @out_modified_old: (out) (transfer container) (element-type RpmOstreePackage): Return location for modified old packages
@@ -165,7 +164,6 @@ gboolean
 rpm_ostree_db_diff (OstreeRepo               *repo,
                     const char               *orig_ref,
                     const char               *new_ref,
-                    GVariant                 *query,
                     GPtrArray               **out_removed,
                     GPtrArray               **out_added,
                     GPtrArray               **out_modified_old,
@@ -185,7 +183,6 @@ rpm_ostree_db_diff (OstreeRepo               *repo,
   guint i;
   HyPackage pkg;
 
-  g_return_val_if_fail (query == NULL, FALSE);
   g_return_val_if_fail (out_removed != NULL && out_added != NULL &&
                         out_modified_old != NULL && out_modified_new != NULL, FALSE);
 
diff --git a/src/lib/rpmostree-db.h b/src/lib/rpmostree-db.h
index c41ae9ea..7924feb6 100644
--- a/src/lib/rpmostree-db.h
+++ b/src/lib/rpmostree-db.h
@@ -33,7 +33,6 @@ _RPMOSTREE_EXTERN GPtrArray *rpm_ostree_db_query_all (OstreeRepo               *
 _RPMOSTREE_EXTERN gboolean rpm_ostree_db_diff (OstreeRepo               *repo,
                                                const char               *orig_ref,
                                                const char               *new_ref,
-                                               GVariant                 *query,
                                                GPtrArray               **out_removed,
                                                GPtrArray               **out_added,
                                                GPtrArray               **out_modified_old,
diff --git a/tests/manual/test-dbquery.py b/tests/manual/test-dbquery.py
index 746dcd01..bd96158c 100644
--- a/tests/manual/test-dbquery.py
+++ b/tests/manual/test-dbquery.py
@@ -12,7 +12,7 @@ print "Package list: "
 for p in qr:
     print p.get_nevra()
 
-_,removed,added,modold,modnew = RpmOstree.db_diff(r, ref + '^', ref, None, None)
+_,removed,added,modold,modnew = RpmOstree.db_diff(r, ref + '^', ref, None)
 for p in removed:
     print "D " + p.get_nevra()
 for p in added: