diff --git a/sphinx/ext/viewcode.py b/sphinx/ext/viewcode.py
index 25e5fe82a..68655146a 100644
--- a/sphinx/ext/viewcode.py
+++ b/sphinx/ext/viewcode.py
@@ -146,7 +146,7 @@ def collect_pages(app):
 #    app.builder.info(' (%d module code pages)' %
 #                     len(env._viewcode_modules), nonl=1)
 
-    for modname, entry in status_iterator(iteritems(env._viewcode_modules),  # type: ignore
+    for modname, entry in status_iterator(sorted(iteritems(env._viewcode_modules)),  # type: ignore
                                           'highlighting module code... ', "blue",
                                           len(env._viewcode_modules),  # type: ignore
                                           app.verbosity, lambda x: x[0]):