diff --git a/django/db/models/query.py b/django/db/models/query.py
index e33a858a81..c06a37897e 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -307,11 +307,13 @@ class QuerySet(object):
         for arg in args:
             kwargs[arg.default_alias] = arg
 
+        query = self.query.clone()
+
         for (alias, aggregate_expr) in kwargs.items():
-            self.query.add_aggregate(aggregate_expr, self.model, alias,
+            query.add_aggregate(aggregate_expr, self.model, alias,
                 is_summary=True)
 
-        return self.query.get_aggregation()
+        return query.get_aggregation()
 
     def count(self):
         """
diff --git a/tests/regressiontests/aggregation_regress/models.py b/tests/regressiontests/aggregation_regress/models.py
index 24de920290..fc2c44b09e 100644
--- a/tests/regressiontests/aggregation_regress/models.py
+++ b/tests/regressiontests/aggregation_regress/models.py
@@ -200,6 +200,12 @@ FieldError: Cannot resolve keyword 'foo' into field. Choices are: authors, conta
 >>> sorted([(b.name, b.authors__age__avg, b.publisher.name, b.contact.name) for b in books])
 [(u'Artificial Intelligence: A Modern Approach', 51.5, u'Prentice Hall', u'Peter Norvig'), (u'Practical Django Projects', 29.0, u'Apress', u'James Bennett'), (u'Python Web Development with Django', 30.3..., u'Prentice Hall', u'Jeffrey Forcier'), (u'Sams Teach Yourself Django in 24 Hours', 45.0, u'Sams', u'Brad Dayley')]
 
+# Regression for #10199 - Aggregate calls clone the original query so the original query can still be used
+>>> books = Book.objects.all()
+>>> _ = books.aggregate(Avg('authors__age'))
+>>> books.all()
+[<Book: Artificial Intelligence: A Modern Approach>, <Book: Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp>, <Book: Practical Django Projects>, <Book: Python Web Development with Django>, <Book: Sams Teach Yourself Django in 24 Hours>, <Book: The Definitive Guide to Django: Web Development Done Right>]
+
 """
 }