diff --git a/src/applications/diffusion/query/blame/DiffusionGitBlameQuery.php b/src/applications/diffusion/query/blame/DiffusionGitBlameQuery.php
--- a/src/applications/diffusion/query/blame/DiffusionGitBlameQuery.php
+++ b/src/applications/diffusion/query/blame/DiffusionGitBlameQuery.php
@@ -7,8 +7,12 @@
 
     $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);
   }