diff --git a/django/db/models/query.py b/django/db/models/query.py
index e33a858a814a9..c06a37897e2ca 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -307,11 +307,13 @@ def aggregate(self, *args, **kwargs):
         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 24de920290db7..fc2c44b09eb19 100644
--- a/tests/regressiontests/aggregation_regress/models.py
+++ b/tests/regressiontests/aggregation_regress/models.py
@@ -200,6 +200,12 @@ def __unicode__(self):
 >>> 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>]
+
 """
 }