diff --git a/include/LDtkLoader/Entity.hpp b/include/LDtkLoader/Entity.hpp
index 61e236f..79dbf1e 100644
--- a/include/LDtkLoader/Entity.hpp
+++ b/include/LDtkLoader/Entity.hpp
@@ -29,7 +29,7 @@ namespace ldtk {
         Entity(const Entity&) = delete;
         Entity(Entity&&) noexcept = default;
         auto operator=(const Entity&) -> Entity& = delete;
-        auto operator=(Entity&&) -> Entity& = default;
+        auto operator=(Entity&&) -> Entity& = delete;
 
         const Layer* const layer;
         const IID iid;
diff --git a/include/LDtkLoader/Enum.hpp b/include/LDtkLoader/Enum.hpp
index f118e3b..8f7229e 100644
--- a/include/LDtkLoader/Enum.hpp
+++ b/include/LDtkLoader/Enum.hpp
@@ -53,7 +53,7 @@ namespace ldtk {
         Enum(const Enum&) = delete;
         Enum(Enum&&) noexcept = default;
         auto operator=(const Enum&) -> Enum& = delete;
-        auto operator=(Enum&&) -> Enum& = default;
+        auto operator=(Enum&&) -> Enum& = delete;
 
         const std::string name;
         const int uid;
diff --git a/include/LDtkLoader/Layer.hpp b/include/LDtkLoader/Layer.hpp
index 41e002c..3c2bca7 100644
--- a/include/LDtkLoader/Layer.hpp
+++ b/include/LDtkLoader/Layer.hpp
@@ -25,7 +25,7 @@ namespace ldtk {
         Layer(const Layer&) = delete;
         Layer(Layer&&) noexcept = default;
         auto operator=(const Layer&) -> Layer& = delete;
-        auto operator=(Layer&&) -> Layer& = default;
+        auto operator=(Layer&&) -> Layer& = delete;
 
         const Level* const level;
         const IID iid;
diff --git a/include/LDtkLoader/World.hpp b/include/LDtkLoader/World.hpp
index ab4bb19..164103e 100644
--- a/include/LDtkLoader/World.hpp
+++ b/include/LDtkLoader/World.hpp
@@ -24,7 +24,7 @@ namespace ldtk {
         World(const World&) = delete;
         World(World&&) noexcept = default;
         auto operator=(const World&) -> World& = delete;
-        auto operator=(World&&) -> World& = default;
+        auto operator=(World&&) -> World& = delete;
 
         const IID iid;