diff --git a/clang/utils/CIndex/completion_logger_server.py b/clang/utils/CIndex/completion_logger_server.py
index 759c79bac58d..076fa73ef49d 100755
--- a/clang/utils/CIndex/completion_logger_server.py
+++ b/clang/utils/CIndex/completion_logger_server.py
@@ -30,7 +30,7 @@ def main():
       break
     else:
       f.write("{ ");
-      f.write("\"time\": \"{0}\"".format(datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S')))
+      f.write("\"time\": \"{0}\"".format(datetime.datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S')))
       f.write(", \"sender\": \"{0}\" ".format(addr[0]))
       f.write(", data: ")
       f.write(data)