diff --git a/views/index.hbs b/views/index.hbs
index 389577c..0bde606 100644
--- a/views/index.hbs
+++ b/views/index.hbs
@@ -31,7 +31,8 @@
         keyMap: "vim",
         matchBrackets: true,
         showCursorWhenSelecting: true,
-        viewportMargin: Infinity
+        viewportMargin: Infinity,
+        tabSize: 4
     });
     // Add my .vimrc stuff.
     CodeMirror.Vim.map('jj', '<Esc>', 'insert')