diff --git a/source/game/StarPlayerUniverseMap.cpp b/source/game/StarPlayerUniverseMap.cpp
index 2f911ea..64f20d7 100644
--- a/source/game/StarPlayerUniverseMap.cpp
+++ b/source/game/StarPlayerUniverseMap.cpp
@@ -71,30 +71,30 @@ List<pair<Vec3I, OrbitBookmark>> PlayerUniverseMap::orbitBookmarks() const {
   return bookmarks;
 }
 
-void PlayerUniverseMap::addOrbitBookmark(CelestialCoordinate const& system, OrbitBookmark const& bookmark) {
+bool PlayerUniverseMap::addOrbitBookmark(CelestialCoordinate const& system, OrbitBookmark const& bookmark) {
   if (system.isNull())
     throw StarException("Cannot add orbit bookmark to null system");
 
-  m_universeMaps[*m_serverUuid].systems[system.location()].bookmarks.add(std::move(bookmark));
+  return m_universeMaps[*m_serverUuid].systems[system.location()].bookmarks.add(std::move(bookmark));
 }
 
-void PlayerUniverseMap::removeOrbitBookmark(CelestialCoordinate const& system, OrbitBookmark const& bookmark) {
+bool PlayerUniverseMap::removeOrbitBookmark(CelestialCoordinate const& system, OrbitBookmark const& bookmark) {
   if (system.isNull())
     throw StarException("Cannot remove orbit bookmark from null system");
 
-  m_universeMaps[*m_serverUuid].systems[system.location()].bookmarks.remove(bookmark);
+  return m_universeMaps[*m_serverUuid].systems[system.location()].bookmarks.remove(bookmark);
 }
 
 List<TeleportBookmark> PlayerUniverseMap::teleportBookmarks() const {
   return universeMap().teleportBookmarks.values();
 }
 
-void PlayerUniverseMap::addTeleportBookmark(TeleportBookmark bookmark) {
-  m_universeMaps[*m_serverUuid].teleportBookmarks.add(std::move(bookmark));
+bool PlayerUniverseMap::addTeleportBookmark(TeleportBookmark bookmark) {
+  return m_universeMaps[*m_serverUuid].teleportBookmarks.add(std::move(bookmark));
 }
 
-void PlayerUniverseMap::removeTeleportBookmark(TeleportBookmark const& bookmark) {
-  m_universeMaps[*m_serverUuid].teleportBookmarks.remove(bookmark);
+bool PlayerUniverseMap::removeTeleportBookmark(TeleportBookmark const& bookmark) {
+  return m_universeMaps[*m_serverUuid].teleportBookmarks.remove(bookmark);
 }
 
 void PlayerUniverseMap::invalidateWarpAction(WarpAction const& warpAction) {
diff --git a/source/game/StarPlayerUniverseMap.hpp b/source/game/StarPlayerUniverseMap.hpp
index fad0c41..bf8efec 100644
--- a/source/game/StarPlayerUniverseMap.hpp
+++ b/source/game/StarPlayerUniverseMap.hpp
@@ -53,12 +53,12 @@ public:
 
   // pair of system location and bookmark, not all orbit bookmarks include the system
   List<pair<Vec3I, OrbitBookmark>> orbitBookmarks() const;
-  void addOrbitBookmark(CelestialCoordinate const& system, OrbitBookmark const& bookmark);
-  void removeOrbitBookmark(CelestialCoordinate const& system, OrbitBookmark const& bookmark);
+  bool addOrbitBookmark(CelestialCoordinate const& system, OrbitBookmark const& bookmark);
+  bool removeOrbitBookmark(CelestialCoordinate const& system, OrbitBookmark const& bookmark);
 
   List<TeleportBookmark> teleportBookmarks() const;
-  void addTeleportBookmark(TeleportBookmark bookmark);
-  void removeTeleportBookmark(TeleportBookmark const& bookmark);
+  bool addTeleportBookmark(TeleportBookmark bookmark);
+  bool removeTeleportBookmark(TeleportBookmark const& bookmark);
   void invalidateWarpAction(WarpAction const& bookmark);
 
   Maybe<OrbitBookmark> worldBookmark(CelestialCoordinate const& world) const;
diff --git a/source/game/scripting/StarPlayerLuaBindings.cpp b/source/game/scripting/StarPlayerLuaBindings.cpp
index 5f12ee3..c12efc1 100644
--- a/source/game/scripting/StarPlayerLuaBindings.cpp
+++ b/source/game/scripting/StarPlayerLuaBindings.cpp
@@ -594,12 +594,12 @@ LuaCallbacks LuaBindings::makePlayerCallbacks(Player* player) {
         });
     });
 
-  callbacks.registerCallback("addOrbitBookmark", [player](Json const& system, Json const& bookmarkConfig) {
+  callbacks.registerCallback("addOrbitBookmark", [player](Json const& system, Json const& bookmarkConfig) -> bool {
       CelestialCoordinate coordinate = CelestialCoordinate(system);
       return player->universeMap()->addOrbitBookmark(coordinate, OrbitBookmark::fromJson(bookmarkConfig));
     });
 
-  callbacks.registerCallback("removeOrbitBookmark", [player](Json const& system, Json const& bookmarkConfig) {
+  callbacks.registerCallback("removeOrbitBookmark", [player](Json const& system, Json const& bookmarkConfig) -> bool {
       CelestialCoordinate coordinate = CelestialCoordinate(system);
       return player->universeMap()->removeOrbitBookmark(coordinate, OrbitBookmark::fromJson(bookmarkConfig));
     });
@@ -610,11 +610,11 @@ LuaCallbacks LuaBindings::makePlayerCallbacks(Player* player) {
       });
     });
 
-  callbacks.registerCallback("addTeleportBookmark", [player](Json const& bookmarkConfig) {
+  callbacks.registerCallback("addTeleportBookmark", [player](Json const& bookmarkConfig) -> bool {
       return player->universeMap()->addTeleportBookmark(TeleportBookmark::fromJson(bookmarkConfig));
     });
 
-  callbacks.registerCallback("removeTeleportBookmark", [player](Json const& bookmarkConfig) {
+  callbacks.registerCallback("removeTeleportBookmark", [player](Json const& bookmarkConfig) -> bool {
       player->universeMap()->removeTeleportBookmark(TeleportBookmark::fromJson(bookmarkConfig));
     });