diff --git a/src/applications/diffusion/query/history/mercurial/DiffusionMercurialHistoryQuery.php b/src/applications/diffusion/query/history/mercurial/DiffusionMercurialHistoryQuery.php
index 1cd3d0b4d2..c1aafb5e2e 100644
--- a/src/applications/diffusion/query/history/mercurial/DiffusionMercurialHistoryQuery.php
+++ b/src/applications/diffusion/query/history/mercurial/DiffusionMercurialHistoryQuery.php
@@ -32,8 +32,9 @@ final class DiffusionMercurialHistoryQuery extends DiffusionHistoryQuery {
     // in the log).
     $default_path = '';
 
+    // NOTE: --branch used to be called --only-branch; use -b for compatibility.
     list($stdout) = $repository->execxLocalCommand(
-      'log --debug --template %s --limit %d --branch %s --rev %s:0 -- %s',
+      'log --debug --template %s --limit %d -b %s --rev %s:0 -- %s',
       '{node};{parents}\\n',
       ($this->getOffset() + $this->getLimit()), // No '--skip' in Mercurial.
       $drequest->getBranch(),
diff --git a/src/applications/diffusion/query/lastmodified/mercurial/DiffusionMercurialLastModifiedQuery.php b/src/applications/diffusion/query/lastmodified/mercurial/DiffusionMercurialLastModifiedQuery.php
index 3c55063830..ee8ae64e8b 100644
--- a/src/applications/diffusion/query/lastmodified/mercurial/DiffusionMercurialLastModifiedQuery.php
+++ b/src/applications/diffusion/query/lastmodified/mercurial/DiffusionMercurialLastModifiedQuery.php
@@ -27,7 +27,7 @@ final class DiffusionMercurialLastModifiedQuery
 
     // TODO: Share some of this with History query.
     list($hash) = $repository->execxLocalCommand(
-      'log --template %s --limit 1 --branch %s --rev %s:0 -- %s',
+      'log --template %s --limit 1 -b %s --rev %s:0 -- %s',
       '{node}',
       $drequest->getBranch(),
       $drequest->getCommit(),