diff --git a/source/dub/data/settings.d b/source/dub/data/settings.d
index 20c6672..a4de43c 100644
--- a/source/dub/data/settings.d
+++ b/source/dub/data/settings.d
@@ -195,7 +195,7 @@
     import std.exception : assertThrown;
 
     const str1 = `{
-  "skipRegistry": "all"
-`;
+  "skipRegistry": "default_"
+}`;
     assertThrown!Exception(parseConfigString!Settings(str1, "/dev/null"));
 }