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-rw-r--r--lib/std/jsonutils.nim3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/std/jsonutils.nim b/lib/std/jsonutils.nim
index 19384b5d1..722ea49b5 100644
--- a/lib/std/jsonutils.nim
+++ b/lib/std/jsonutils.nim
@@ -34,6 +34,9 @@ import macros
 from enumutils import symbolName
 from typetraits import OrdinalEnum
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
 when not defined(nimFixedForwardGeneric):
   # xxx remove pending csources_v1 update >= 1.2.0
   proc to[T](node: JsonNode, t: typedesc[T]): T =