diff --git a/apps/runtime_source_add_delete/deepstream_rt_src_add_del.py b/apps/runtime_source_add_delete/deepstream_rt_src_add_del.py
index 991bd9a..6a4512d 100644
--- a/apps/runtime_source_add_delete/deepstream_rt_src_add_del.py
+++ b/apps/runtime_source_add_delete/deepstream_rt_src_add_del.py
@@ -230,6 +230,7 @@ def add_sources(data):
     global g_num_sources
     global g_source_enabled
     global g_source_bin_list
+    global pipeline
 
     source_id = g_num_sources