diff --git a/faststreams/inputs.nim b/faststreams/inputs.nim
index 92257fa..ebea223 100644
--- a/faststreams/inputs.nim
+++ b/faststreams/inputs.nim
@@ -821,7 +821,7 @@ template useHeapMem(_: Natural) =
     addr buffer[0]
 
 template useStackMem(n: static Natural) =
-  var buffer: array[n, byte]
+  var buffer: array[n + 1, byte]
 
   template allocMem(_: Natural): ptr byte =
     addr buffer[0]