diff --git a/shadowsocks/obfsplugin/http_simple.py b/shadowsocks/obfsplugin/http_simple.py
index 6783a32..6937213 100644
--- a/shadowsocks/obfsplugin/http_simple.py
+++ b/shadowsocks/obfsplugin/http_simple.py
@@ -145,7 +145,7 @@ class http_simple(plain.plain):
         self.has_sent_header = True
         self.has_recv_header = True
         if self.method == 'http_simple':
-            return (b'E', False, False)
+            return (b'E'*64, False, False)
         return (buf, True, False)
 
     def server_decode(self, buf):
@@ -212,7 +212,7 @@ class http_post(http_simple):
         self.has_sent_header = True
         self.has_recv_header = True
         if self.method == 'http_post':
-            return (b'E', False, False)
+            return (b'E'*64, False, False)
         return (buf, True, False)
 
     def server_decode(self, buf):
@@ -292,7 +292,7 @@ class random_head(plain.plain):
         if crc != 0xffffffff:
             self.has_sent_header = True
             if self.method == 'random_head':
-                return (b'E', False, False)
+                return (b'E'*64, False, False)
             return (buf, True, False)
         # (buffer_to_recv, is_need_decrypt, is_need_to_encode_and_send_back)
         return (b'', False, True)
diff --git a/shadowsocks/obfsplugin/obfs_tls.py b/shadowsocks/obfsplugin/obfs_tls.py
index 529444e..e217d12 100644
--- a/shadowsocks/obfsplugin/obfs_tls.py
+++ b/shadowsocks/obfsplugin/obfs_tls.py
@@ -104,7 +104,7 @@ class tls_simple(plain.plain):
     def decode_error_return(self, buf):
         self.has_sent_header = True
         if self.method == 'tls_simple':
-            return (b'E', False, False)
+            return (b'E'*64, False, False)
         return (buf, True, False)
 
     def server_decode(self, buf):
@@ -205,7 +205,7 @@ class tls_auth(plain.plain):
         self.raw_trans_sent = True
         self.raw_trans_recv = True
         if self.method == 'tls1.0_session_auth':
-            return (b'E', False, False)
+            return (b'E'*64, False, False)
         return (buf, True, False)
 
     def server_decode(self, buf):
@@ -384,7 +384,7 @@ class tls_ticket_auth(plain.plain):
     def decode_error_return(self, buf):
         self.handshake_status = -1
         if self.method == 'tls1.2_session_auth':
-            return (b'E', False, False)
+            return (b'E'*64, False, False)
         return (buf, True, False)
 
     def server_decode(self, buf):