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-rw-r--r--lib/pure/os.nim3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index 07040d611..76164bc49 100644
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -34,6 +34,9 @@ import std/private/since
 
 import strutils, pathnorm
 
+when defined(nimPreviewSlimSystem):
+  import std/syncio
+
 const weirdTarget = defined(nimscript) or defined(js)
 
 since (1, 1):