diff --git a/test-mtasker.cc b/test-mtasker.cc
index f6f1b5b46..fd7e52899 100644
--- a/test-mtasker.cc
+++ b/test-mtasker.cc
@@ -48,7 +48,7 @@ static void willThrow(void* p)
 
 BOOST_AUTO_TEST_CASE(test_MtaskerException) {
   BOOST_CHECK_THROW( {
-      MTasker<> mt;
+      MTasker<> mt(200000); // stack-size default value from pdns_recursor.cc.
       mt.makeThread(willThrow, 0);
       struct timeval now;
       
