diff --git a/francedata/pipelines.py b/francedata/pipelines.py
index fcf1f91484f9c910dbc644dd71821ef2f847bf29..c497e5a4d5eb7d3a62ba75b0af742ae8f6d97319 100644
--- a/francedata/pipelines.py
+++ b/francedata/pipelines.py
@@ -28,7 +28,7 @@ class FrancedataPipeline(object):
         self.json = gzip.open(outfile, 'wb')
 
     def spider_opened(self, spider):
-        self.json.write('[')
+        self.json.write('['.encode())
 
         try:
             spider.set_pipeline(self)
@@ -43,7 +43,7 @@ class FrancedataPipeline(object):
                 self.urls.add(item['url'])
 
         if self.has_items:
-            self.json.write(',\n')
+            self.json.write(',\n'.encode())
 
         json.dump(item, self.json, cls=ScrapyJSONEncoder)
         self.has_items = True
@@ -51,5 +51,5 @@ class FrancedataPipeline(object):
         return item
 
     def spider_closed(self, spider):
-        self.json.write(']')
+        self.json.write(']'.encode())
         self.json.close()