diff --git a/moztelemetry/heka/message_parser.py b/moztelemetry/heka/message_parser.py
index 5e65071..df7ec93 100644
--- a/moztelemetry/heka/message_parser.py
+++ b/moztelemetry/heka/message_parser.py
@@ -35,7 +35,7 @@ def _parse_heka_record(record):
             # because it contains null values for JSON fields that have been
             # split out.
             if field.name == 'submission':
-                payload = _parse_json(field.value_bytes[0].decode('utf-8'))
+                payload = _parse_json(field.value_bytes[0].decode('utf-8', 'replace'))
                 break
 
     if payload is None:
diff --git a/tests/data/test_invalid_utf8.heka b/tests/data/test_invalid_utf8.heka
new file mode 100644
index 0000000..4a415f8
--- /dev/null
+++ b/tests/data/test_invalid_utf8.heka
@@ -0,0 +1,23 @@
+µ¤
+XY>$ª¤Bý£M¬Ò§4܀ıÂÔ²ÀÏ	telemetry"	telemetryJip-172-31-43-1R
+submissionDate"20170201R�¡
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moz_bookmarks WHERE fk = h.id AND title NOTNULL ORDER BY lastModified DESC LIMIT 1 ) AS btitle, ( SELECT GROUP_CONCAT(t.title, :private) FROM moz_bookmarks b JOIN moz_bookmarks t ON t.id = +b.parent AND t.parent = :parent WHERE b.fk = h.id ) AS tags, h.visit_count, h.typed, h.id, :query_type, t.open_count FROM ( SELECT ROUND( MAX(use_count) * (1 + (input = :search_string)), 1 ) AS rank, place_id FROM moz_inputhistory WHERE input BETWEEN :search_string AND :search_string || X:private GROUP BY place_id ) AS i JOIN moz_places h ON h.id = i.place_id LEFT JOIN moz_favicons f ON f.id = h.favicon_id LEFT JOIN moz_openpages_temp t ON t.url = h.url WHERE AUTOCOMPLETE_MATCH(NULL, h.url, IFNULL(btitle, h.title), tags, h.visit_count, h.typed, bookmarked, t.open_count, :matchBehavior, :searchBehavior) ORDER BY rank DESC, h.frecency DESC  /* places.sqlite */":[2,243],"VACUUM /* places.sqlite */":[1,820],"UPDATE moz_places SET frecency = CALCULATE_FRECENCY(id) WHERE frecency < 0 /* places.sqlite */":[11,3134],"DELETE FROM moz_cookies WHERE name = :name AND host = :host AND path = :path /* cookies.sqlite */":[1,151],"UPDATE moz_cookies SET lastAccessed = :lastAccessed WHERE name = :name AND host = :host AND path = :path /* cookies.sqlite */":[7,5430],"UPDATE moz_hosts SET permission = ?2, expireType= ?3, expireTime = ?4 WHERE id = ?1 /* permissions.sqlite */":[1,185],"INSERT INTO moz_hosts (id, host, type, permission, expireType, expireTime, appId, isInBrowserElement) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8) /* permissions.sqlite */":[1,151],"UPDATE moz_places SET title = :page_title WHERE id = :page_id  /* places.sqlite */":[26,4222],"SELECT 1 FROM moz_places h WHERE url = ?1 AND last_visit_date NOTNULL  /* places.sqlite */":[3,382],"COMMIT TRANSACTION /* places.sqlite */":[1937,298933],"INSERT INTO expiration_notify (v_id, url, guid, visit_date, expected_results) SELECT v.id, h.url, h.guid, v.visit_date, :limit_visits FROM moz_historyvisits v JOIN moz_places h ON h.id = v.place_id WHERE (SELECT COUNT(*) FROM moz_places) > :max_uris AND visit_date < strftime(:private,:private,:private,:private,:private,:private) * 1000000 ORDER BY v.visit_date ASC LIMIT :limit_visits /* places.sqlite */":[4,678],"INSERT OR REPLACE INTO moz_openpages_temp (url, open_count) VALUES (:page_url, IFNULL((SELECT open_count + 1 FROM moz_openpages_temp WHERE url = :page_url ), 1)) /* places.sqlite */":[3,902],"INSERT INTO moz_historyvisits (from_visit, place_id, visit_date, visit_type, session) VALUES (:from_visit, :page_id, :visit_date, :visit_type, :session)  /* places.sqlite */":[1,286],"/* do not warn (bug 487787) */ SELECT (SELECT REPLACE(url, :private, :query_string) FROM moz_places WHERE id = b.fk) AS search_url, h.title, IFNULL(f.url, (SELECT f.url FROM moz_places JOIN moz_favicons f ON f.id = favicon_id WHERE rev_host = (SELECT rev_host FROM moz_places WHERE id = b.fk) ORDER BY frecency DESC LIMIT 1) ), 1, b.title, NULL, h.visit_count, h.typed, IFNULL(h.id, b.fk), :query_type, t.open_count FROM moz_keywords k JOIN moz_bookmarks b ON b.keyword_id = k.id LEFT JOIN moz_places h ON h.url = search_url LEFT JOIN moz_favicons f ON f.id = h.favicon_id LEFT JOIN moz_openpages_temp t ON t.url = search_url WHERE LOWER(k.keyword) = LOWER(:keyword) ORDER BY h.frecency DESC  /* places.sqlite */":[4,1238],"SELECT internal_id, id, syncGUID, location, version, type, internalName, updateURL, updateKey, optionsURL, optionsType, aboutURL, iconURL, icon64URL, defaultLocale, visible, active, userDisabled, appDisabled, pendingUninstall, descriptor, installDate, updateDate, applyBackgroundUpdates, bootstrap, skinnable, size, sourceURI, releaseNotesURI, softDisabled, isForeignInstall, hasBinaryComponents, strictCompatibility FROM addon WHERE visible=1 /* extensions.sqlite */":[1,105],"UPDATE moz_openpages_temp SET open_count = open_count - 1 WHERE url = :page_url /* places.sqlite */":[1,164],"SELECT prefs.value AS value FROM prefs JOIN groups ON prefs.groupID = groups.id JOIN settings ON prefs.settingID = settings.id WHERE groups.name = :group AND settings.name = :setting /* content-prefs.sqlite */":[1,100],"SELECT h.url, h.title, f.url, EXISTS(SELECT 1 FROM moz_bookmarks WHERE fk = h.id) AS bookmarked, ( SELECT title FROM moz_bookmarks WHERE fk = h.id AND title NOTNULL ORDER BY lastModified DESC LIMIT 1 ) AS btitle, ( SELECT GROUP_CONCAT(t.title, :private) FROM moz_bookmarks b JOIN moz_bookmarks t ON t.id = +b.parent AND t.parent = :parent WHERE b.fk = h.id ) AS tags, h.visit_count, h.typed, h.id, :query_type, t.open_count FROM moz_places h LEFT JOIN moz_favicons f ON f.id = h.favicon_id LEFT JOIN moz_openpages_temp t ON t.url = h.url WHERE h.frecency <> 0 AND AUTOCOMPLETE_MATCH(:searchString, h.url, IFNULL(btitle, h.title), tags, h.visit_count, h.typed, bookmarked, t.open_count, :matchBehavior, :searchBehavior)  ORDER BY h.frecency DESC, h.id DESC LIMIT :maxResults /* places.sqlite */":[4,530],"ANALYZE moz_places /* places.sqlite */":[8,1116],"INSERT INTO moz_places (url, title, rev_host, hidden, typed, frecency, guid) VALUES (:url, :title, :rev_host, :hidden, :typed, :frecency, :guid)  /* places.sqlite */":[3,1122]}},"chromeHangs":[],"addonHistograms":{},"info":{"reason":"idle-daily","OS":"WINNT","appID":"{ec8030f7-c20a-464f-9b0e-13a3a9e97384}","appVersion":"18.0.1","appName":"Firefox","appBuildID":"20130116073211","appUpdateChannel":"release","platformBuildID":"20130116073211","locale":"es-ES","cpucount":4,"memsize":3058,"arch":"x86","version":"6.1","hasMMX":true,"hasSSE":true,"hasSSE2":true,"hasSSE3":true,"hasSSSE3":true,"hasSSE4A":false,"hasSSE4_1":true,"hasSSE4_2":true,"hasEDSP":false,"hasARMv6":false,"hasARMv7":false,"hasNEON":false,"adapterDescription":"Tarjeta gráfica VGA estándar","adapterVendorID":"0x10de","adapterDeviceID":"0x10c3","adapterRAM":"Unknown","adapterDriver":"vga framebuf vga256 vga64k","adapterDriverVersion":"6.1.7600.16385","adapterDriverDate":"6-21-2006","DWriteVersion":"6.1.7600.16385","addons":"%7B972ce4c6-7e08-4474-a285-3208198ce6fd%7D:18.0.1","flashVersion":"24.0.0.194"}}R
+
+appVersion"UNKNOWNR
+
+sourceName"	telemetryR
+telemetryEnabled@
R
+appUpdateChannel"UNKNOWNR
+
sourceVersion"
1R2
+
+documentId"$39edf9a9-734f-428d-9e2f-1cc97abd2e06R
+docType"UNKNOWNR
+geoCity"??R
+
+geoCountry"BOR
+Host"data.mozilla.comR
+
+appBuildId"UNKNOWNR
+normalizedChannel"OtherR
+appName"UNKNOWN
\ No newline at end of file
diff --git a/tests/heka/test_message_parser.py b/tests/heka/test_message_parser.py
index 74de751..59e2045 100644
--- a/tests/heka/test_message_parser.py
+++ b/tests/heka/test_message_parser.py
@@ -78,3 +78,10 @@ def test_telemetry(data_dir):
         for r in message_parser.parse_heka_message(o):
             assert set(r.keys()) == top_keys
             assert set(r["payload"].keys()) == payload_keys
+
+
+def test_invalid_utf8(data_dir):
+    filename = "{}/test_invalid_utf8.heka".format(data_dir)
+    with open(filename, "rb") as o:
+        for r in message_parser.parse_heka_message(o):
+            assert(u'\ufffd' in r['info']['adapterDescription'])