diff --git a/datajoint/relational_operand.py b/datajoint/relational_operand.py
index 9e98fd1e9..293cbce38 100644
--- a/datajoint/relational_operand.py
+++ b/datajoint/relational_operand.py
@@ -301,7 +301,7 @@ def __init__(self, arg, *attributes, **renamed_attributes):
             else:
                 self._attributes.append(attribute)
 
-        if arg.heading.computed:
+        if arg.heading.computed or arg.restrictions:
             self._arg = Subquery(arg)
         else:
             self._arg = arg
diff --git a/tests/test_relational_operand.py b/tests/test_relational_operand.py
index f7851dc72..a6c19a46e 100644
--- a/tests/test_relational_operand.py
+++ b/tests/test_relational_operand.py
@@ -216,6 +216,18 @@ def test_project():
         assert_equal(set(x.heading.names), set(('id_a', 'a')),
                      'extend does not work')
 
+        # projection after restriction
+        assert_equal(
+            len(D() & (L() & 'cond_in_l')) + len(D() - (L() & 'cond_in_l')),
+            len(D()),
+            'failed semijoin or antijoin'
+        )
+        assert_equal(
+            len((D() - (L() & 'cond_in_l')).project()),
+            len(D() - (L() & 'cond_in_l')),
+            'projection altered the cardinality of a restricted relation'
+        )
+
     @staticmethod
     def test_aggregate():
         x = B().aggregate(C(), 'n', count='count(id_c)', mean='avg(value)', max='max(value)')