diff --git a/telegram/inputfile.py b/telegram/inputfile.py
index 9a5103df2..ec42b85ff 100644
--- a/telegram/inputfile.py
+++ b/telegram/inputfile.py
@@ -67,7 +67,7 @@ class InputFile(object):
 
         if isinstance(self.input_file, file):
             self.input_file_content = self.input_file.read()
-            if 'filename' in self.data and self.data['filename']:
+            if 'filename' in self.data:
                 self.filename = self.data['filename']
             else:
                 self.filename = os.path.basename(self.input_file.name)