diff --git a/lib/system/gc_stack.nim b/lib/system/gc_stack.nim
index 5f72b8959..6f492c307 100644
--- a/lib/system/gc_stack.nim
+++ b/lib/system/gc_stack.nim
@@ -79,6 +79,7 @@ template withRegion*(r: MemRegion; body: untyped) =
   try:
     body
   finally:
+    r = tlRegion
     tlRegion = oldRegion
 
 template inc(p: pointer, s: int) =