diff --git a/src/applications/diffusion/query/blame/DiffusionGitBlameQuery.php b/src/applications/diffusion/query/blame/DiffusionGitBlameQuery.php
index f98cc645a7..0eb15cd018 100644
--- a/src/applications/diffusion/query/blame/DiffusionGitBlameQuery.php
+++ b/src/applications/diffusion/query/blame/DiffusionGitBlameQuery.php
@@ -1,34 +1,38 @@
 <?php
 
 final class DiffusionGitBlameQuery extends DiffusionBlameQuery {
 
   protected function newBlameFuture(DiffusionRequest $request, $path) {
     $repository = $request->getRepository();
 
     $commit = $request->getCommit();
 
+    // NOTE: The "--root" flag suppresses the addition of the "^" boundary
+    // commit marker. Without it, root commits render with a "^" before them,
+    // and one fewer character of the commit hash.
+
     return $repository->getLocalCommandFuture(
-      '--no-pager blame -s -l %s -- %s',
+      '--no-pager blame --root -s -l %s -- %s',
       $commit,
       $path);
   }
 
   protected function resolveBlameFuture(ExecFuture $future) {
     list($err, $stdout) = $future->resolve();
 
     if ($err) {
       return null;
     }
 
     $result = array();
 
     $lines = phutil_split_lines($stdout);
     foreach ($lines as $line) {
       list($commit) = explode(' ', $line, 2);
       $result[] = $commit;
     }
 
     return $result;
   }
 
 }