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-rw-r--r--lib/pure/asyncfutures.nim1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/pure/asyncfutures.nim b/lib/pure/asyncfutures.nim
index e91b99c3a..035b6182d 100644
--- a/lib/pure/asyncfutures.nim
+++ b/lib/pure/asyncfutures.nim
@@ -13,6 +13,7 @@ import system/stacktraces
 
 when defined(nimPreviewSlimSystem):
   import std/objectdollar # for StackTraceEntry
+  import std/assertions
 
 # TODO: This shouldn't need to be included, but should ideally be exported.
 type