diff --git a/src/calibre/ebooks/conversion/plugins/mobi_input.py b/src/calibre/ebooks/conversion/plugins/mobi_input.py
index df65715450..55e3c7f0d3 100644
--- a/src/calibre/ebooks/conversion/plugins/mobi_input.py
+++ b/src/calibre/ebooks/conversion/plugins/mobi_input.py
@@ -12,7 +12,7 @@ class MOBIInput(InputFormatPlugin):
     name        = 'MOBI Input'
     author      = 'Kovid Goyal'
     description = 'Convert MOBI files (.mobi, .prc, .azw) to HTML'
-    file_types  = set(['mobi', 'prc', 'azw', 'azw3'])
+    file_types  = set(['mobi', 'prc', 'azw', 'azw3', 'pobi'])
 
     def convert(self, stream, options, file_ext, log,
                 accelerators):