diff --git a/splunklib/modularinput/event_writer.py b/splunklib/modularinput/event_writer.py
index 5f8c5aa8..38a110c1 100644
--- a/splunklib/modularinput/event_writer.py
+++ b/splunklib/modularinput/event_writer.py
@@ -77,7 +77,7 @@ def write_xml_document(self, document):
 
         :param document: An ``ElementTree`` object.
         """
-        self._out.write(ensure_str(ET.tostring(document)))
+        self._out.write(ensure_str(ET.tostring(document), errors="replace"))
         self._out.flush()
 
     def close(self):
diff --git a/splunklib/searchcommands/search_command.py b/splunklib/searchcommands/search_command.py
index dd11391d..30b1d1c2 100644
--- a/splunklib/searchcommands/search_command.py
+++ b/splunklib/searchcommands/search_command.py
@@ -934,7 +934,7 @@ def _read_chunk(istream):
         except Exception as error:
             raise RuntimeError('Failed to read body of length {}: {}'.format(body_length, error))
 
-        return metadata, six.ensure_str(body)
+        return metadata, six.ensure_str(body, errors="replace")
 
     _header = re.compile(r'chunked\s+1.0\s*,\s*(\d+)\s*,\s*(\d+)\s*\n')