diff --git a/ansi-tests/remove-duplicates.lsp b/ansi-tests/remove-duplicates.lsp
index 58dc556ec558719b4149e8cd09c881160e431d31..f1d837799ab3ce891b82548fc855166eec02e4ec 100644
--- a/ansi-tests/remove-duplicates.lsp
+++ b/ansi-tests/remove-duplicates.lsp
@@ -237,7 +237,7 @@
   (signals-error (remove-duplicates (list 'a 'b 'c) :key #'car) type-error)
   t)
 
-(deftest remove-duplicates.error.9
+(deftest remove-duplicates.error.10
   (check-type-error #'remove-duplicates #'sequencep)
   nil)