diff --git a/cartographer_rviz/cartographer_rviz/submaps_display.cc b/cartographer_rviz/cartographer_rviz/submaps_display.cc
index d88d245..8730105 100644
--- a/cartographer_rviz/cartographer_rviz/submaps_display.cc
+++ b/cartographer_rviz/cartographer_rviz/submaps_display.cc
@@ -39,7 +39,6 @@ constexpr int kMaxOnGoingRequestsPerTrajectory = 6;
 constexpr char kMaterialsDirectory[] = "/ogre_media/materials";
 constexpr char kGlsl120Directory[] = "/glsl120";
 constexpr char kScriptsDirectory[] = "/scripts";
-constexpr char kDefaultMapFrame[] = "map";
 constexpr char kDefaultTrackingFrame[] = "base_link";
 constexpr char kDefaultSubmapQueryServiceName[] = "/submap_query";