diff --git a/graphene_django/views.py b/graphene_django/views.py
index b29aeed..d487f96 100644
--- a/graphene_django/views.py
+++ b/graphene_django/views.py
@@ -112,7 +112,7 @@ class GraphQLView(View):
         self.pretty = self.pretty or pretty
         self.graphiql = self.graphiql or graphiql
         self.batch = self.batch or batch
-        self.execution_context_class = execution_context_class
+        self.execution_context_class = execution_context_class or self.execution_context_class
         if subscription_path is None:
             self.subscription_path = graphene_settings.SUBSCRIPTION_PATH