2 files changed, 8 insertions, 0 deletions
diff --git a/lib/pure/collections/hashcommon.nim b/lib/pure/collections/hashcommon.nim
index a169418ce..deff8fa21 100644
--- a/lib/pure/collections/hashcommon.nim
+++ b/lib/pure/collections/hashcommon.nim
@@ -10,6 +10,10 @@
 # An `include` file which contains common code for
 # hash sets and tables.
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+
 const
   growthFactor = 2
 
diff --git a/lib/pure/collections/sequtils.nim b/lib/pure/collections/sequtils.nim
index 64a7be7a9..5e9b492c2 100644
--- a/lib/pure/collections/sequtils.nim
+++ b/lib/pure/collections/sequtils.nim
@@ -84,6 +84,10 @@ import std/private/since
 
 import macros
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+
 when defined(nimHasEffectsOf):
   {.experimental: "strictEffects".}
 else: