diff --git a/rest_framework/tests/models.py b/rest_framework/tests/models.py
index e171d3bd9..38d184b1e 100644
--- a/rest_framework/tests/models.py
+++ b/rest_framework/tests/models.py
@@ -143,7 +143,7 @@ class ForeignKeyTarget(RESTFrameworkModel):
 
 class ForeignKeySource(RESTFrameworkModel):
     name = models.CharField(max_length=100)
-    target = models.ForeignKey(ForeignKeyTarget, related_name='sources',
+    target = models.ForeignKey(ForeignKeyTarget, related_name='sources',editable=False,
                                help_text='Target', verbose_name='Target')