diff --git a/protocol/src/main/resources/es/buffer/ByteBuffer.mjs b/protocol/src/main/resources/es/buffer/ByteBuffer.mjs
index 292f8626..acc83dbc 100644
--- a/protocol/src/main/resources/es/buffer/ByteBuffer.mjs
+++ b/protocol/src/main/resources/es/buffer/ByteBuffer.mjs
@@ -1,5 +1,5 @@
-import { readInt64, writeInt64 } from './longbits';
-import ProtocolManager from '../ProtocolManager';
+import { readInt64, writeInt64 } from './longbits.mjs';
+import ProtocolManager from '../ProtocolManager.mjs';
 
 const empty_str = '';
 const initSize = 128;
diff --git a/protocol/src/main/resources/es/buffer/longbits.mjs b/protocol/src/main/resources/es/buffer/longbits.mjs
index 3d838fca..29156127 100644
--- a/protocol/src/main/resources/es/buffer/longbits.mjs
+++ b/protocol/src/main/resources/es/buffer/longbits.mjs
@@ -1,5 +1,5 @@
 // from protobuf
-import Long from './long';
+import Long from './long.mjs';
 
 /**
  * Constructs new long bits.