diff --git a/lib/system/threadlocalstorage.nim b/lib/system/threadlocalstorage.nim
index eeef0ccf8..b8ffee721 100644
--- a/lib/system/threadlocalstorage.nim
+++ b/lib/system/threadlocalstorage.nim
@@ -209,6 +209,12 @@ type
       tls: ThreadLocalStorage
     else:
       nil
+    when hasSharedHeap:
+      next, prev: PGcThread
+      stackBottom, stackTop: pointer
+      stackSize: int
+    else:
+      nil
 
 when emulatedThreadVars:
   var globalsSlot: ThreadVarSlot