diff --git a/src/calibre/customize/builtins.py b/src/calibre/customize/builtins.py
index b29d67065d..6258434b1d 100644
--- a/src/calibre/customize/builtins.py
+++ b/src/calibre/customize/builtins.py
@@ -255,7 +255,7 @@ class LRXMetadataReader(MetadataReaderPlugin):
 class MOBIMetadataReader(MetadataReaderPlugin):
 
     name        = 'Read MOBI metadata'
-    file_types  = set(['mobi', 'prc', 'azw', 'azw4'])
+    file_types  = set(['mobi', 'prc', 'azw', 'azw4', 'pobi'])
     description = _('Read metadata from %s files')%'MOBI'
 
     def get_metadata(self, stream, ftype):
diff --git a/src/calibre/devices/kindle/driver.py b/src/calibre/devices/kindle/driver.py
index 35a73f86f0..78b4368950 100644
--- a/src/calibre/devices/kindle/driver.py
+++ b/src/calibre/devices/kindle/driver.py
@@ -287,7 +287,7 @@ class KINDLE2(KINDLE):
     name           = 'Kindle 2/3 Device Interface'
     description    = _('Communicate with the Kindle 2/3 eBook reader.')
 
-    FORMATS        = KINDLE.FORMATS + ['pdf', 'azw4']
+    FORMATS        = KINDLE.FORMATS + ['pdf', 'azw4', 'pobi']
     DELETE_EXTS    = KINDLE.DELETE_EXTS
 
     PRODUCT_ID = [0x0002, 0x0004]
diff --git a/src/calibre/ebooks/__init__.py b/src/calibre/ebooks/__init__.py
index ebb30df8ab..5cfddda2f3 100644
--- a/src/calibre/ebooks/__init__.py
+++ b/src/calibre/ebooks/__init__.py
@@ -30,7 +30,7 @@ BOOK_EXTENSIONS = ['lrf', 'rar', 'zip', 'rtf', 'lit', 'txt', 'txtz', 'text', 'ht
                    'html', 'htmlz', 'xhtml', 'pdf', 'pdb', 'pdr', 'prc', 'mobi', 'azw', 'doc',
                    'epub', 'fb2', 'djv', 'djvu', 'lrx', 'cbr', 'cbz', 'cbc', 'oebzip',
                    'rb', 'imp', 'odt', 'chm', 'tpz', 'azw1', 'pml', 'pmlz', 'mbp', 'tan', 'snb',
-                   'xps', 'oxps', 'azw4', 'book', 'zbf']
+                   'xps', 'oxps', 'azw4', 'book', 'zbf', 'pobi']
 
 class HTMLRenderer(object):