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-rw-r--r--lib/system/threads.nim2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/system/threads.nim b/lib/system/threads.nim
index 4855a2b93..7743fffff 100644
--- a/lib/system/threads.nim
+++ b/lib/system/threads.nim
@@ -593,6 +593,8 @@ elif defined(genode):
   proc createThread*[TArg](t: var Thread[TArg],
                            tp: proc (arg: TArg) {.thread, nimcall.},
                            param: TArg) =
+    t.core = cast[PGcThread](allocShared0(sizeof(GcThread)))
+
     when TArg isnot void: t.data = param
     t.dataFn = tp
     when hasSharedHeap: t.stackSize = ThreadStackSize