diff --git a/moto/dynamodb2/models.py b/moto/dynamodb2/models.py
index 2b686b111..a4d8feb3c 100644
--- a/moto/dynamodb2/models.py
+++ b/moto/dynamodb2/models.py
@@ -493,7 +493,8 @@ class Table(BaseModel):
 
         if projection_expression:
             expressions = [x.strip() for x in projection_expression.split(',')]
-            for result in copy.deepcopy(possible_results):
+            results = copy.deepcopy(results)
+            for result in results:
                 for attr in list(result.attrs):
                     if attr not in expressions:
                         result.attrs.pop(attr)
diff --git a/tests/test_dynamodb2/test_dynamodb.py b/tests/test_dynamodb2/test_dynamodb.py
index 085470896..87175cfef 100644
--- a/tests/test_dynamodb2/test_dynamodb.py
+++ b/tests/test_dynamodb2/test_dynamodb.py
@@ -367,8 +367,10 @@ def test_basic_projection_expressions():
     )
 
     assert 'body' in results['Items'][0]
+    assert 'subject' not in results['Items'][0]
     assert results['Items'][0]['body'] == 'some test message'
     assert 'body' in results['Items'][1]
+    assert 'subject' not in results['Items'][1]
     assert results['Items'][1]['body'] == 'yet another test message'
 
     # The projection expression should not remove data from storage