diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 04ed748b..9d52ee66 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -38,7 +38,7 @@ Before submitting a pull request make sure that the following tests pass:
 
 ```
   cd tests
-  NOMINATIM_DIR=<builddir> lettuce -t -Fail features/db features/osm2pgsql
+  NOMINATIM_DIR=<builddir> lettuce -t -Fail -t -Tiger features/db features/osm2pgsql
 ```
 
 ```