diff --git a/src-python/amazon/ion/reader_binary.py b/src-python/amazon/ion/reader_binary.py
index 6b5d8d5d..7447a355 100644
--- a/src-python/amazon/ion/reader_binary.py
+++ b/src-python/amazon/ion/reader_binary.py
@@ -494,6 +494,9 @@ def _rslice(data, rem, size):
 
 
 def _int_factory(sign, data):
+    if sign < 0 and not any(data):
+        raise IonException('Negative zero is not a valid int.')
+
     def parse_int():
         value = 0
         length = len(data)
diff --git a/tests/test_reader_binary.py b/tests/test_reader_binary.py
index f92f85ae..f36baa69 100644
--- a/tests/test_reader_binary.py
+++ b/tests/test_reader_binary.py
@@ -117,6 +117,8 @@ def _prepend_ivm(params):
     (b'\xe4\x81\x84\xb2\x21\x01', 'ANNOT LENGTH TOO SHORT - CONTAINER'),
     # The annotation wrapper declares 3 octets, but the subfields (including an int) take up four.
     (b'\xe3\x81\x84\x21\x01', 'ANNOT LENGTH TOO SHORT - SCALAR'),
+    # A negative int with a magnitude of zero (negative zero) is illegal.
+    (b'\x31\x00', 'NEGATIVE INT ZERO'),
     # TODO: annnotated nop is a fail
 
     # TODO: value within container is longer than container.
diff --git a/tests/test_vectors.py b/tests/test_vectors.py
index 431a4f91..9b98e708 100644
--- a/tests/test_vectors.py
+++ b/tests/test_vectors.py
@@ -113,7 +113,6 @@ def _open(file):
     _bad_file(u'localSymbolTableWithMultipleImportsFields.10n'),  # TODO amazon-ion/ion-python#118
     _bad_file(u'localSymbolTableWithMultipleSymbolsAndImportsFields.10n'),  # TODO amazon-ion/ion-python#118
     _bad_file(u'localSymbolTableWithMultipleSymbolsFields.10n'),  # TODO amazon-ion/ion-python#118
-    _bad_file(u'negativeIntZero.10n'),  # TODO amazon-ion/ion-python#119
     _equivs_file(u'timestampSuperfluousOffset.10n')  # TODO amazon-ion/ion-python#121
 )