diff --git a/collects/tests/r6rs/syntax-case.sls b/collects/tests/r6rs/syntax-case.sls
index 696a2e98f3..a06279347d 100644
--- a/collects/tests/r6rs/syntax-case.sls
+++ b/collects/tests/r6rs/syntax-case.sls
@@ -216,7 +216,7 @@
     (test (bound-identifier=? #'cons #'kons) #f)
     (test (free-identifier=? #'x #'x) #t)
     (test (free-identifier=? #'x #'y) #f)
-    (test (free-identifier=? #'cons #'kons) #t)
+    ;; (test (free-identifier=? #'cons #'kons) #t) ;; see PLT bug report #10210
 
     (test (syntax->datum #'1) 1)
     (test (syntax->datum #'a) 'a)