diff --git a/setup.py b/setup.py
index a6daa90..8701a55 100644
--- a/setup.py
+++ b/setup.py
@@ -357,7 +357,7 @@ def set_curl_libs():
 try:
   EXTRA_OBJECTS = [os.environ["EXTRA_OBJECTS"]]
 except:
-  EXTRA_OBJECTS = ''
+  EXTRA_OBJECTS = []
 
 #
 # Done with environment variables.