diff --git a/googleapiclient/sample_tools.py b/googleapiclient/sample_tools.py
index 3e56c0a..2b4e7b4 100644
--- a/googleapiclient/sample_tools.py
+++ b/googleapiclient/sample_tools.py
@@ -95,9 +95,9 @@
     service = discovery.build(name, version, http=http)
   else:
     # Construct a service object using a local discovery document file.
-	with open(discovery_filename) as discovery_file:
-	  service = discovery.build_from_document(
-		  discovery_file.read(),
-		  base='https://www.googleapis.com/',
-		  http=http)
+    with open(discovery_filename) as discovery_file:
+      service = discovery.build_from_document(
+          discovery_file.read(),
+          base='https://www.googleapis.com/',
+          http=http)
   return (service, flags)