diff --git a/scrapy/commands/__init__.py b/scrapy/commands/__init__.py
index db834b40e15..492ed089bbd 100644
--- a/scrapy/commands/__init__.py
+++ b/scrapy/commands/__init__.py
@@ -192,7 +192,7 @@ def validate_feed_exporter(self, opts):
         if opts.output:
             default_extensions = [
                 e
-                for e in EXTENSIONS_BASE.keys()
+                for e in EXTENSIONS_BASE
                 if e not in ["scrapy.extensions.feedexport.FeedExporter"]
             ]
             extensions = build_component_list(self.settings.getwithbase("EXTENSIONS"))