diff --git a/src/plugins/mercurial/mercurialcontrol.cpp b/src/plugins/mercurial/mercurialcontrol.cpp
index 753b3c71366..0dd8711dda0 100644
--- a/src/plugins/mercurial/mercurialcontrol.cpp
+++ b/src/plugins/mercurial/mercurialcontrol.cpp
@@ -136,6 +136,11 @@ bool MercurialControl::vcsAnnotate(const QString &file, int line)
     return true;
 }
 
+QString MercurialControl::vcsTopic(const QString &directory)
+{
+    return mercurialClient->branchQuerySync(directory);
+}
+
 bool MercurialControl::sccManaged(const QString &filename)
 {
     const QFileInfo fi(filename);
diff --git a/src/plugins/mercurial/mercurialcontrol.h b/src/plugins/mercurial/mercurialcontrol.h
index 067dcf1c787..a5a1d1c8f1a 100644
--- a/src/plugins/mercurial/mercurialcontrol.h
+++ b/src/plugins/mercurial/mercurialcontrol.h
@@ -65,6 +65,7 @@ public:
     QString vcsGetRepositoryURL(const QString &directory);
     bool sccManaged(const QString &filename);
     bool vcsAnnotate(const QString &file, int line);
+    QString vcsTopic(const QString &directory);
 
 public slots:
     // To be connected to the HgTask's success signal to emit the repository/