diff --git a/extra/benchmark/spectral-norm/spectral-norm.factor b/extra/benchmark/spectral-norm/spectral-norm.factor
index 6d4d42116c..3c20a1ceff 100644
--- a/extra/benchmark/spectral-norm/spectral-norm.factor
+++ b/extra/benchmark/spectral-norm/spectral-norm.factor
@@ -41,7 +41,7 @@ IN: benchmark.spectral-norm
     ] times ; inline
 
 : spectral-norm ( n -- norm )
-    u/v [ v. ] keep norm-sq /f sqrt ;
+    u/v [ v. ] [ norm-sq ] bi /f sqrt ;
 
 HINTS: spectral-norm fixnum ;