1 files changed, 4 insertions, 0 deletions

diff --git a/compiler/ic/dce.nim b/compiler/ic/dce.nim
index 0a436a5d1..bc61a38de 100644
--- a/compiler/ic/dce.nim
+++ b/compiler/ic/dce.nim
@@ -10,6 +10,10 @@
 ## Dead code elimination (=DCE) for IC.
 
 import std/[intsets, tables]
+
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
 import ".." / [ast, options, lineinfos, types]
 
 import packed_ast, ic, bitabs