diff --git a/src/org/wikipedia/Wiki.java b/src/org/wikipedia/Wiki.java
index 6b864b8..a41f241 100644
--- a/src/org/wikipedia/Wiki.java
+++ b/src/org/wikipedia/Wiki.java
@@ -8161,7 +8161,7 @@ else if (value instanceof byte[])
                         multipartPostBody.write("\r\n".getBytes(StandardCharsets.UTF_8));
                     }
                 }
-                multipartPostBody.write((boundary + "--\r\n").getBytes(StandardCharsets.UTF_8));
+                multipartPostBody.write((nextpart + "--\r\n").getBytes(StandardCharsets.UTF_8));
             }
             else
             {