diff --git a/app/types/attachment/write_attachment_data.js b/app/types/attachment/write_attachment_data.js
index 947ea6785e..99a8cfb0cb 100644
--- a/app/types/attachment/write_attachment_data.js
+++ b/app/types/attachment/write_attachment_data.js
@@ -35,6 +35,6 @@ exports._getAttachmentName = () => {
 //      _getAttachmentPath :: Unit -> IO Path
 exports._getAttachmentPath = () => {
   const name = exports._getAttachmentName();
-  const prefix = name.slice(0, 3);
+  const prefix = name.slice(0, 2);
   return Path.join(prefix, name);
 };
diff --git a/test/app/types/attachment/write_attachment_data_test.js b/test/app/types/attachment/write_attachment_data_test.js
index 61a992d883..ae7d768d52 100644
--- a/test/app/types/attachment/write_attachment_data_test.js
+++ b/test/app/types/attachment/write_attachment_data_test.js
@@ -12,7 +12,7 @@ const {
 } = require('../../../../app/types/attachment/write_attachment_data');
 
 
-const PREFIX_LENGTH = 3;
+const PREFIX_LENGTH = 2;
 const NUM_SEPARATORS = 1;
 const NAME_LENGTH = 64;
 const PATH_LENGTH = PREFIX_LENGTH + NUM_SEPARATORS + NAME_LENGTH;