diff --git a/config/defaults.json b/config/defaults.json
index a58caac..ecc605f 100644
--- a/config/defaults.json
+++ b/config/defaults.json
@@ -40,6 +40,7 @@
     "version": "1.0",
     "targets": {
       "auto_discover": false,
+      "canonical_sources": ["whosonfirst", "openstreetmap", "openaddresses", "geonames"],
       "layers_by_source": {
         "openstreetmap": [ "address", "venue", "street" ],
         "openaddresses": [ "address" ],
diff --git a/test/expected-deep.json b/test/expected-deep.json
index 4d67dd8..74800e6 100644
--- a/test/expected-deep.json
+++ b/test/expected-deep.json
@@ -45,6 +45,7 @@
     "version": "1.0",
     "targets": {
       "auto_discover": false,
+      "canonical_sources": ["whosonfirst", "openstreetmap", "openaddresses", "geonames"],
       "layers_by_source": {
         "openstreetmap": [ "address", "venue", "street" ],
         "openaddresses": [ "address" ],