diff --git a/test/stdlib/3.3-exclude.sh b/test/stdlib/3.3-exclude.sh
index a45c81ca..170e25e8 100644
--- a/test/stdlib/3.3-exclude.sh
+++ b/test/stdlib/3.3-exclude.sh
@@ -10,7 +10,7 @@ SKIP_TESTS=(
     #       tgt.append(elem)
     [test_itertools.py]=1
 
-    [test_buffer.py]=pytest  # FIXME: Works on c90ff51
+    [test_buffer.py]=pytest
     [test_cmath.py]=pytest
 
     [test_atexit.py]=1  # The atexit test starting at 3.3 looks for specific comments in error lines
@@ -19,7 +19,6 @@ SKIP_TESTS=(
     [test_concurrent_futures.py]=1  # too long?
 
     [test_decimal.py]=1 # test takes too long to run: 18 seconds
-    [test_descr.py]=1  # test assertion errors
     [test_doctest.py]=1  # test assertion errors
     [test_doctest2.py]=1  # test assertion errors
     [test_dis.py]=1   # We change line numbers - duh!
diff --git a/test/stdlib/3.4-exclude.sh b/test/stdlib/3.4-exclude.sh
index 641cf906..b398b8e9 100644
--- a/test/stdlib/3.4-exclude.sh
+++ b/test/stdlib/3.4-exclude.sh
@@ -26,7 +26,16 @@ SKIP_TESTS=(
 
     [test_dbm_gnu.py]=1   # fails on its own
     [test_devpoll.py]=1 # it fails on its own
+
     [test_descr.py]=1   # test assertion errors
+    # ERROR: test_reent_set_bases_on_base (__main__.MroTest)
+    # Traceback (most recent call last):
+    # File "test_descr.py", line 5521, in test_reent_set_bases_on_base
+    # class A(metaclass=M):
+    # File "test_descr.py", line 5472, in __new__
+    # return type.__new__(mcls, name, bases, attrs)
+    # TypeError: 'NoneType' object is not iterable
+
     [test_dis.py]=1   # We change line numbers - duh!
     [test_distutils.py]=1 # it fails on its own
     [test_doctest2.py]=1