diff --git a/MANIFEST.in b/MANIFEST.in
index 9154e7b..7e85b3a 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -5,6 +5,7 @@
 recursive-include apiclient *.json *.py
 recursive-include oauth2 *.py
 recursive-include docs *.html
+recursive-include simplejson *.py *.c
 recursive-include samples *.py *.png *.html *.yaml *.json
 include runtests.py
 include runsamples.py