diff --git a/resources/metadata_sqlite.sql b/resources/metadata_sqlite.sql
index 6af5466041..454b271465 100644
--- a/resources/metadata_sqlite.sql
+++ b/resources/metadata_sqlite.sql
@@ -135,7 +135,7 @@ CREATE TABLE last_read_positions ( id INTEGER PRIMARY KEY,
 	device TEXT NOT NULL,
 	cfi TEXT NOT NULL,
 	epoch REAL NOT NULL,
-	extra TEXT DEFAULT '',
+	pos_frac REAL NOT NULL DEFAULT 0,
 	UNIQUE(user, device, book, format)
 );
 
diff --git a/src/calibre/db/cache.py b/src/calibre/db/cache.py
index 3f878ed281..ff24c62655 100644
--- a/src/calibre/db/cache.py
+++ b/src/calibre/db/cache.py
@@ -2136,14 +2136,14 @@ class Cache(object):
     def get_last_read_positions(self, book_id, fmt, user):
         fmt = fmt.upper()
         ans = []
-        for device, cfi, epoch in self.backend.execute(
-                'SELECT device,cfi,epoch FROM last_read_positions WHERE book=? AND format=? AND user=?',
+        for device, cfi, epoch, pos_frac in self.backend.execute(
+                'SELECT device,cfi,epoch,pos_frac FROM last_read_positions WHERE book=? AND format=? AND user=?',
                 (book_id, fmt, user)):
-            ans.append({'device':device, 'cfi': cfi, 'epoch':epoch})
+            ans.append({'device':device, 'cfi': cfi, 'epoch':epoch, 'pos_frac':pos_frac})
         return ans
 
     @write_api
-    def set_last_read_position(self, book_id, fmt, user='_', device='_', cfi=None, epoch=None):
+    def set_last_read_position(self, book_id, fmt, user='_', device='_', cfi=None, epoch=None, pos_frac=0):
         fmt = fmt.upper()
         device = device or '_'
         user = user or '_'
@@ -2153,8 +2153,8 @@ class Cache(object):
                 (book_id, fmt, user, device))
         else:
             self.backend.execute(
-                'INSERT OR REPLACE INTO last_read_positions(book,format,user,device,cfi,epoch) VALUES (?,?,?,?,?,?)',
-                (book_id, fmt, user, device, cfi, epoch or time()))
+                'INSERT OR REPLACE INTO last_read_positions(book,format,user,device,cfi,epoch,pos_frac) VALUES (?,?,?,?,?,?,?)',
+                (book_id, fmt, user, device, cfi, epoch or time(), pos_frac))
 
     @read_api
     def export_library(self, library_key, exporter, progress=None, abort=None):
diff --git a/src/calibre/db/schema_upgrades.py b/src/calibre/db/schema_upgrades.py
index a32f593f16..decb6278bc 100644
--- a/src/calibre/db/schema_upgrades.py
+++ b/src/calibre/db/schema_upgrades.py
@@ -652,7 +652,7 @@ CREATE TABLE last_read_positions ( id INTEGER PRIMARY KEY,
     device TEXT NOT NULL,
     cfi TEXT NOT NULL,
     epoch REAL NOT NULL,
-    extra TEXT DEFAULT '',
+    pos_frac REAL NOT NULL DEFAULT 0,
     UNIQUE(user, device, book, format)
 );
 DROP INDEX IF EXISTS lrp_idx;
diff --git a/src/calibre/db/tests/metadata.db b/src/calibre/db/tests/metadata.db
index 0757bc5e0e..fb8345a101 100644
Binary files a/src/calibre/db/tests/metadata.db and b/src/calibre/db/tests/metadata.db differ
diff --git a/src/calibre/db/tests/reading.py b/src/calibre/db/tests/reading.py
index 050e4edd9b..0886680414 100644
--- a/src/calibre/db/tests/reading.py
+++ b/src/calibre/db/tests/reading.py
@@ -675,9 +675,9 @@ class ReadingTest(BaseTest):
         self.assertFalse(cache.get_last_read_positions(1, 'x', 'u'))
         self.assertRaises(Exception, cache.set_last_read_position, 12, 'x', cfi='c')
         epoch = time()
-        cache.set_last_read_position(1, 'EPUB', 'user', 'device', 'cFi', epoch)
+        cache.set_last_read_position(1, 'EPUB', 'user', 'device', 'cFi', epoch, 0.3)
         self.assertFalse(cache.get_last_read_positions(1, 'x', 'u'))
-        self.assertEqual(cache.get_last_read_positions(1, 'ePuB', 'user'), [{'epoch':epoch, 'device':'device', 'cfi':'cFi'}])
+        self.assertEqual(cache.get_last_read_positions(1, 'ePuB', 'user'), [{'epoch':epoch, 'device':'device', 'cfi':'cFi', 'pos_frac':0.3}])
         cache.set_last_read_position(1, 'EPUB', 'user', 'device')
         self.assertFalse(cache.get_last_read_positions(1, 'ePuB', 'user'))
     # }}}