diff --git a/collects/tests/mzscheme/basic.ss b/collects/tests/mzscheme/basic.ss
index 27acbd44da..20addb9c99 100644
--- a/collects/tests/mzscheme/basic.ss
+++ b/collects/tests/mzscheme/basic.ss
@@ -301,7 +301,8 @@
 (test #f immutable? 1)
 (test #t immutable? #(1 2 3))
 (test #f immutable? (vector 1 2 3))
-(test #f immutable? #())
+(test #f immutable? (vector))
+(test #t immutable? #())
 (test #f immutable? (string-copy "hi"))
 
 (test #t immutable? "hi")