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-rw-r--r--youtube_dl/downloader/external.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/youtube_dl/downloader/external.py b/youtube_dl/downloader/external.py
index 012057ecb..e47e3bf4c 100644
--- a/youtube_dl/downloader/external.py
+++ b/youtube_dl/downloader/external.py
@@ -48,7 +48,7 @@ class ExternalFD(FileDownloader):
def _source_address(self, command_option):
command_part = []
source_address = self.ydl.params.get('source_address')
- if source_address:
+ if source_address is None:
command_part = [command_option, source_address]
return command_part