diff --git a/.gitignore b/.gitignore
index 32e1dc0..dc859ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
 nimcache/
 nimblecache/
 htmldocs/
+
+/tests/megatest*
+/outputGotten.txt
diff --git a/threading/channels.nim b/threading/channels.nim
index 6e21cf1..76b82a0 100644
--- a/threading/channels.nim
+++ b/threading/channels.nim
@@ -82,6 +82,10 @@ runnableExamples("--threads:on --gc:orc"):
 when not defined(gcArc) and not defined(gcOrc) and not defined(nimdoc):
   {.error: "This channel implementation requires --gc:arc or --gc:orc".}
 
+when defined(nimPreviewSlimSystem):
+  import std/typedthreads
+  import std/assertions
+
 import std/[locks, atomics, isolation]
 import system/ansi_c