diff --git a/compatibility-test/tests/mzlib/pconvert.rktl b/compatibility-test/tests/mzlib/pconvert.rktl
index 523a24d..048b9c4 100644
--- a/compatibility-test/tests/mzlib/pconvert.rktl
+++ b/compatibility-test/tests/mzlib/pconvert.rktl
@@ -217,6 +217,12 @@
                        (hash-set! ht 'x 1)
                        ht)
                      '(make-hash (list (cons 'x 1))))
+     (make-same-test (make-immutable-hasheq)
+                     '(make-immutable-hasheq))
+     (make-same-test (make-immutable-hash)
+                     '(make-immutable-hash))
+     (make-same-test (make-immutable-hash (list (cons 'x 1)))
+                     '(make-immutable-hash (list (cons 'x 1))))
      (make-pctest (list 'a (box (list '())) (cons 1 '()))
                   '(list (quote a) (box (list empty)) (list 1))
                   '(list (quote a) (box (list empty)) (list 1))
@@ -321,13 +327,13 @@
                               (-8- `(,-4- ,-5- (2 3))))
                            -0-))
      (make-pctest (read (open-input-string "#hasheq((#0=(1 . #0#) . a))"))
-                  '(shared ((-1- (cons 1 -1-))) (make-hasheq (list (cons -1- 'a))))
-                  '(shared ((-1- (cons 1 -1-))) (make-hasheq (list (cons -1- 'a))))
-                  '(shared ((-1- (cons 1 -1-))) (make-hasheq (list (cons -1- 'a))))
-                  '(shared ((-1- `(1 unquote -1-))) (make-hasheq (list (cons -1- 'a))))
-                  '(shared ((-1- `(1 unquote -1-))) (make-hasheq (list (cons -1- 'a))))
-                  '(shared ((-1- `(1 unquote -1-))) (make-hasheq (list (cons -1- 'a))))
-                  '(shared ((-1- (cons 1 -1-))) (make-hasheq (list (cons -1- 'a)))))))
+                  '(shared ((-1- (cons 1 -1-))) (make-immutable-hasheq (list (cons -1- 'a))))
+                  '(shared ((-1- (cons 1 -1-))) (make-immutable-hasheq (list (cons -1- 'a))))
+                  '(shared ((-1- (cons 1 -1-))) (make-immutable-hasheq (list (cons -1- 'a))))
+                  '(shared ((-1- `(1 unquote -1-))) (make-immutable-hasheq (list (cons -1- 'a))))
+                  '(shared ((-1- `(1 unquote -1-))) (make-immutable-hasheq (list (cons -1- 'a))))
+                  '(shared ((-1- `(1 unquote -1-))) (make-immutable-hasheq (list (cons -1- 'a))))
+                  '(shared ((-1- (cons 1 -1-))) (make-immutable-hasheq (list (cons -1- 'a)))))))
   (for-each run-test tests))
 
 (let ()