diff --git a/lib/core/macros.nim b/lib/core/macros.nim
index 9cb694bd85..28f52f0a93 100644
--- a/lib/core/macros.nim
+++ b/lib/core/macros.nim
@@ -947,6 +947,8 @@ proc treeTraverse(n: NimNode; res: var string; level = 0; isLisp = false, indent
     discard # same as nil node in this representation
   of nnkCharLit .. nnkInt64Lit:
     res.add(" " & $n.intVal)
+  of nnkUIntLit .. nnkUInt64Lit:
+    res.add(" " & $cast[uint64](n.intVal))
   of nnkFloatLit .. nnkFloat64Lit:
     res.add(" " & $n.floatVal)
   of nnkStrLit .. nnkTripleStrLit, nnkCommentStmt, nnkIdent, nnkSym:
diff --git a/tests/macros/t21593.nim b/tests/macros/t21593.nim
new file mode 100644
index 0000000000..b0b7ebe757
--- /dev/null
+++ b/tests/macros/t21593.nim
@@ -0,0 +1,13 @@
+discard """
+nimout: '''
+StmtList
+  UIntLit 18446744073709551615
+  IntLit -1'''
+"""
+
+import macros
+
+dumpTree:
+  0xFFFFFFFF_FFFFFFFF'u
+  0xFFFFFFFF_FFFFFFFF
+