diff --git a/source/dub/recipe/json.d b/source/dub/recipe/json.d
index 8bba635..5f1603b 100644
--- a/source/dub/recipe/json.d
+++ b/source/dub/recipe/json.d
@@ -236,7 +236,7 @@
 	}
 }
 
-Json toJson(in ref BuildSettingsTemplate bs)
+private Json toJson(in ref BuildSettingsTemplate bs)
 {
 	auto ret = Json.emptyObject;
 	if( bs.dependencies !is null ){