diff --git a/tests/data/test3026 b/tests/data/test3026
index fb80cc83f6..9654c07bfe 100644
--- a/tests/data/test3026
+++ b/tests/data/test3026
@@ -18,6 +18,7 @@ slow
 # require the threaded resolver only because it means pthreads might
 # be used for it
 <features>
+threadsafe
 threaded-resolver
 !win32
 </features>