diff --git a/src/calibre/customize/profiles.py b/src/calibre/customize/profiles.py
index f60f7b5e7b..12debef5cc 100644
--- a/src/calibre/customize/profiles.py
+++ b/src/calibre/customize/profiles.py
@@ -151,6 +151,10 @@ class OutputProfile(Plugin):
     # The image size for comics
     comic_screen_size = (584, 754)
 
+    @classmethod
+    def tags_to_string(cls, tags):
+        return ', '.join(tags)
+
 class SonyReaderOutput(OutputProfile):
 
     name        = 'Sony Reader'
@@ -236,6 +240,11 @@ class KindleOutput(OutputProfile):
     fbase                     = 16
     fsizes                    = [12, 12, 14, 16, 18, 20, 22, 24]
 
+    @classmethod
+    def tags_to_string(cls, tags):
+        return 'ttt '.join(tags)+'ttt '
+
+
 output_profiles = [OutputProfile, SonyReaderOutput, MSReaderOutput,
         MobipocketOutput, HanlinV3Output, CybookG3Output, KindleOutput,
         SonyReaderLandscapeOutput]
diff --git a/src/calibre/ebooks/oeb/transforms/jacket.py b/src/calibre/ebooks/oeb/transforms/jacket.py
index 78f4ab871e..8c995dadec 100644
--- a/src/calibre/ebooks/oeb/transforms/jacket.py
+++ b/src/calibre/ebooks/oeb/transforms/jacket.py
@@ -70,9 +70,8 @@ class Jacket(object):
                 tags = map(unicode, self.oeb.metadata.subject)
             except:
                 tags = []
-        tags = u'/'.join(tags)
         if tags:
-            tags = '<b>Tags: </b>' + u'/%s/'%tags
+            tags = '<b>Tags: </b>' + self.opts.dest.tags_to_string(tags)
         else:
             tags = ''
         try: