diff --git a/plotly/offline/offline.py b/plotly/offline/offline.py
index f3e6730fb88..a1d24530b80 100644
--- a/plotly/offline/offline.py
+++ b/plotly/offline/offline.py
@@ -161,7 +161,8 @@ def _get_jconfig(config):
 
     plotly_platform_url = plotly.tools.get_config_plotly_server_url()
 
-    clean_config['plotlyServerURL'] = plotly_platform_url
+    if not clean_config.get('plotlyServerURL', None):
+        clean_config['plotlyServerURL'] = plotly_platform_url
 
     if (plotly_platform_url != 'https://plot.ly' and
         clean_config.get('linkText', None) == 'Export to plot.ly'):