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-rw-r--r--compiler/nimconf.nim3
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/nimconf.nim b/compiler/nimconf.nim
index 1cf22e20a..319a3de6d 100644
--- a/compiler/nimconf.nim
+++ b/compiler/nimconf.nim
@@ -13,6 +13,9 @@ import
   llstream, commands, os, strutils, msgs, lexer, ast,
   options, idents, wordrecg, strtabs, lineinfos, pathutils, scriptconfig
 
+when defined(nimPreviewSlimSystem):
+  import std/syncio
+
 # ---------------- configuration file parser -----------------------------
 # we use Nim's lexer here to save space and work