diff --git a/compiler/nimrod.cfg b/compiler/nimrod.cfg
index a0e59aa098..fbebe1cecf 100644
--- a/compiler/nimrod.cfg
+++ b/compiler/nimrod.cfg
@@ -2,6 +2,8 @@
 
 mainModule:"nimrod.nim"
 
+gc:markAndSweep
+
 hint[XDeclaredButNotUsed]:off
 path:"llvm"
 path:"$projectPath/.."