diff --git a/patchwork/tests/series/bugs-multiple-content-types.mbox b/patchwork/tests/series/bugs-multiple-content-types.mbox
new file mode 100644
index 000000000000..f7006b4474ff
--- /dev/null
+++ b/patchwork/tests/series/bugs-multiple-content-types.mbox
@@ -0,0 +1,172 @@
+From mboxrd@z Thu Jan  1 00:00:00 1970
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+From:   YueHaibing <yuehaibing@huawei.com>
+To:     <bjorn.topel@intel.com>, <magnus.karlsson@intel.com>,
+        <jonathan.lemon@gmail.com>, <ast@kernel.org>,
+        <daniel@iogearbox.net>, <kafai@fb.com>, <songliubraving@fb.com>,
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+CC:     YueHaibing <yuehaibing@huawei.com>, <netdev@vger.kernel.org>,
+        <bpf@vger.kernel.org>, <kernel-janitors@vger.kernel.org>
+Subject: [PATCH -next] bpf: Use PTR_ERR_OR_ZERO in xsk_map_inc()
+Date:   Tue, 20 Aug 2019 01:36:52 +0000
+Message-ID: <20190820013652.147041-1-yuehaibing@huawei.com>
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+List-Archive: <https://lore.kernel.org/netdev/>
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+
+Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR
+
+Signed-off-by: YueHaibing <yuehaibing@huawei.com>
+---
+ kernel/bpf/xskmap.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/kernel/bpf/xskmap.c b/kernel/bpf/xskmap.c
+index 4cc28e226398..942c662e2eed 100644
+--- a/kernel/bpf/xskmap.c
++++ b/kernel/bpf/xskmap.c
+@@ -21,7 +21,7 @@ int xsk_map_inc(struct xsk_map *map)
+ 	struct bpf_map *m = &map->map;
+ 
+ 	m = bpf_map_inc(m, false);
+-	return IS_ERR(m) ? PTR_ERR(m) : 0;
++	return PTR_ERR_OR_ZERO(m);
+ }
+ 
+ void xsk_map_put(struct xsk_map *map)
+
+
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+Subject: Re: [PATCH -next] bpf: Use PTR_ERR_OR_ZERO in xsk_map_inc()
+To:     YueHaibing <yuehaibing@huawei.com>, magnus.karlsson@intel.com,
+        jonathan.lemon@gmail.com, ast@kernel.org, daniel@iogearbox.net,
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+From:   =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn.topel@intel.com>
+Message-ID: <93fafdab-8fb3-0f2b-8f36-0cf297db3cd9@intel.com>
+Date:   Tue, 20 Aug 2019 09:28:26 +0200
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+
+On 2019-08-20 03:36, YueHaibing wrote:
+> Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR
+> 
+> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
+> ---
+>   kernel/bpf/xskmap.c | 2 +-
+>   1 file changed, 1 insertion(+), 1 deletion(-)
+> 
+> diff --git a/kernel/bpf/xskmap.c b/kernel/bpf/xskmap.c
+> index 4cc28e226398..942c662e2eed 100644
+> --- a/kernel/bpf/xskmap.c
+> +++ b/kernel/bpf/xskmap.c
+> @@ -21,7 +21,7 @@ int xsk_map_inc(struct xsk_map *map)
+>   	struct bpf_map *m = &map->map;
+>   
+>   	m = bpf_map_inc(m, false);
+> -	return IS_ERR(m) ? PTR_ERR(m) : 0;
+> +	return PTR_ERR_OR_ZERO(m);
+>   }
+>   
+>   void xsk_map_put(struct xsk_map *map)
+>
+
+Acked-by: Björn Töpel <bjorn.topel@intel.com>
+
+Thanks for the patch!
+
+For future patches: Prefix AF_XDP socket work with "xsk:" and use "PATCH
+bpf-next" to let the developers know what tree you're aiming for.
+
+
+
+Cheers!
+Björn
+
+
+> 
+> 
+
+
+
diff --git a/patchwork/tests/test_series.py b/patchwork/tests/test_series.py
index f5e6b5b07220..d78f7dc8b89b 100644
--- a/patchwork/tests/test_series.py
+++ b/patchwork/tests/test_series.py
@@ -11,6 +11,7 @@ from django.test import TestCase
 from patchwork import models
 from patchwork import parser
 from patchwork.tests import utils
+from patchwork.views.utils import patch_to_mbox
 
 
 TEST_SERIES_DIR = os.path.join(os.path.dirname(__file__), 'series')
@@ -267,6 +268,16 @@ class BaseSeriesTest(_BaseTestCase):
         self.assertSerialized(patches, [2])
         self.assertSerialized(covers, [1])
 
+    def test_multiple_content_types(self):
+        """Test what happens when a patch and comment have different
+        Content-Type headers."""
+
+        _, patches, _ = self._parse_mbox(
+            'bugs-multiple-content-types.mbox', [0, 1, 1])
+
+        patch = patches[0]
+        self.assertEqual(patch_to_mbox(patch).count('Content-Type:'), 1)
+
 
 class RevisedSeriesTest(_BaseTestCase):
     """Tests for a series plus a single revision.
diff --git a/patchwork/views/utils.py b/patchwork/views/utils.py
index 1da1aaabf503..d65aa5816336 100644
--- a/patchwork/views/utils.py
+++ b/patchwork/views/utils.py
@@ -84,8 +84,8 @@ def _submission_to_mbox(submission):
 
     orig_headers = HeaderParser().parsestr(str(submission.headers))
     for key, val in orig_headers.items():
-        # we set this ourselves
-        if key == 'Content-Transfer-Encoding':
+        # we set these ourselves
+        if key in ['Content-Type', 'Content-Transfer-Encoding']:
             continue
         # we don't save GPG signatures described in RFC1847 [1] so this
         # Content-Type value is invalid
