diff --git a/lib/mysql/connector/conversion.py b/lib/mysql/connector/conversion.py
index d94e9e99..7a888fe2 100644
--- a/lib/mysql/connector/conversion.py
+++ b/lib/mysql/connector/conversion.py
@@ -169,6 +169,8 @@ def quote(self, buf):
                 return str(buf).encode('ascii')
         elif isinstance(buf, type(None)):
             return bytearray(b"NULL")
+        elif not PY2 and isinstance(buf, (bytes, bytearray)):
+            return bytearray(b"_binary'" + buf + b"'")
         else:
             return bytearray(b"'" + buf + b"'")
 
diff --git a/src/mysql_capi.c b/src/mysql_capi.c
index ea1fe3fd..2574bbe8 100644
--- a/src/mysql_capi.c
+++ b/src/mysql_capi.c
@@ -1778,7 +1778,7 @@ MySQL_convert_to_mysql(MySQL *self, PyObject *args)
         }
         else if (PyBytes_Check(new_value))
         {
-            quoted= PyBytes_FromFormat("'%s'", PyBytes_AsString(new_value));
+            quoted= PyBytes_FromFormat("_binary'%s'", PyBytes_AsString(new_value));
             PyTuple_SET_ITEM(prepared, i, quoted);
 #endif
         }