diff --git a/src/server.cpp b/src/server.cpp
index fc5e8e00b..e9c40bf14 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -127,7 +127,7 @@ class InternalServer {
 
     MustacheData get_default_data() const;
     MustacheData homepage_data() const;
-    Response get_default_response();
+    Response get_default_response() const;
 
     std::shared_ptr<Reader> get_reader(const std::string& bookName) const;
 
@@ -372,7 +372,7 @@ MustacheData InternalServer::get_default_data() const
   return data;
 }
 
-Response InternalServer::get_default_response()
+Response InternalServer::get_default_response() const
 {
   return Response(m_root, m_verbose.load(), m_withTaskbar, m_withLibraryButton, m_blockExternalLinks);
 }