diff --git a/.travis.yml b/.travis.yml
index 8b87bef..844b60c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,7 +17,7 @@ matrix:
       env: TOXENV=py35
     - python: 3.6
       env: TOXENV=py36
-    - python: pypy2.7
+    - python: pypy
       env: TOXENV=pypy
     - python: pypy3.5
       env: TOXENV=pypy3
diff --git a/logzio/sender.py b/logzio/sender.py
index 7b51d53..64cc4bd 100644
--- a/logzio/sender.py
+++ b/logzio/sender.py
@@ -156,7 +156,12 @@ class LogzioSender:
         current_size = 0
         while not self.queue.empty():
             current_log = self.queue.get()
-            current_size += sys.getsizeof(current_log)
+            try:
+                current_size += sys.getsizeof(current_log)
+            except TypeError:
+                # pypy do not support sys.getsizeof
+                current_size += len(current_log) * 4
+
             logs_list.append(current_log)
             if current_size >= MAX_BULK_SIZE_IN_BYTES:
                 break