diff --git a/openpype/hosts/nuke/plugins/publish/extract_thumbnail.py b/openpype/hosts/nuke/plugins/publish/extract_thumbnail.py
index 7ffeec2db94..b9d67628802 100644
--- a/openpype/hosts/nuke/plugins/publish/extract_thumbnail.py
+++ b/openpype/hosts/nuke/plugins/publish/extract_thumbnail.py
@@ -159,7 +159,7 @@ def get_view_process_node(self):
 
         ipn_orig = None
         for v in [n for n in nuke.allNodes()
-            if "Viewer" == n.Class()]:
+                if "Viewer" == n.Class()]:
             ip = v['input_process'].getValue()
             ipn = v['input_process_node'].getValue()
             if "VIEWER_INPUT" not in ipn and ip: