diff --git a/src/Magnum/Platform/AbstractXApplication.h b/src/Magnum/Platform/AbstractXApplication.h
index 386d48e6c..35659563c 100644
--- a/src/Magnum/Platform/AbstractXApplication.h
+++ b/src/Magnum/Platform/AbstractXApplication.h
@@ -386,6 +386,18 @@ class AbstractXApplication::Configuration {
 */
 class AbstractXApplication::ViewportEvent {
     public:
+        /** @brief Copying is not allowed */
+        ViewportEvent(const ViewportEvent&) = delete;
+
+        /** @brief Moving is not allowed */
+        ViewportEvent(ViewportEvent&&) = delete;
+
+        /** @brief Copying is not allowed */
+        ViewportEvent& operator=(const ViewportEvent&) = delete;
+
+        /** @brief Moving is not allowed */
+        ViewportEvent& operator=(ViewportEvent&&) = delete;
+
         /**
          * @brief Window size
          *
@@ -407,7 +419,7 @@ class AbstractXApplication::ViewportEvent {
 
         explicit ViewportEvent(const Vector2i& size): _size{size} {}
 
-        Vector2i _size;
+        const Vector2i _size;
 };
 
 /**
diff --git a/src/Magnum/Platform/AndroidApplication.h b/src/Magnum/Platform/AndroidApplication.h
index f6ba9ada7..a31ca8688 100644
--- a/src/Magnum/Platform/AndroidApplication.h
+++ b/src/Magnum/Platform/AndroidApplication.h
@@ -581,6 +581,18 @@ class AndroidApplication::Configuration {
 */
 class AndroidApplication::ViewportEvent {
     public:
+        /** @brief Copying is not allowed */
+        ViewportEvent(const ViewportEvent&) = delete;
+
+        /** @brief Moving is not allowed */
+        ViewportEvent(ViewportEvent&&) = delete;
+
+        /** @brief Copying is not allowed */
+        ViewportEvent& operator=(const ViewportEvent&) = delete;
+
+        /** @brief Moving is not allowed */
+        ViewportEvent& operator=(ViewportEvent&&) = delete;
+
         /**
          * @brief Window size
          *
@@ -609,7 +621,7 @@ class AndroidApplication::ViewportEvent {
 
         explicit ViewportEvent(const Vector2i& windowSize): _windowSize{windowSize} {}
 
-        Vector2i _windowSize;
+        const Vector2i _windowSize;
 };
 
 /**
@@ -651,7 +663,7 @@ class AndroidApplication::InputEvent {
 
         ~InputEvent() = default;
 
-        AInputEvent* _event;
+        AInputEvent* const _event;
     #endif
 
     private:
diff --git a/src/Magnum/Platform/GlfwApplication.h b/src/Magnum/Platform/GlfwApplication.h
index 4a6b2bcb9..7a2210faf 100644
--- a/src/Magnum/Platform/GlfwApplication.h
+++ b/src/Magnum/Platform/GlfwApplication.h
@@ -1180,6 +1180,18 @@ class GlfwApplication::ExitEvent {
 */
 class GlfwApplication::ViewportEvent {
     public:
+        /** @brief Copying is not allowed */
+        ViewportEvent(const ViewportEvent&) = delete;
+
+        /** @brief Moving is not allowed */
+        ViewportEvent(ViewportEvent&&) = delete;
+
+        /** @brief Copying is not allowed */
+        ViewportEvent& operator=(const ViewportEvent&) = delete;
+
+        /** @brief Moving is not allowed */
+        ViewportEvent& operator=(ViewportEvent&&) = delete;
+
         /**
          * @brief Window size
          *
@@ -1216,8 +1228,9 @@ class GlfwApplication::ViewportEvent {
 
         explicit ViewportEvent(const Vector2i& windowSize, const Vector2i& framebufferSize, const Vector2& dpiScaling): _windowSize{windowSize}, _framebufferSize{framebufferSize}, _dpiScaling{dpiScaling} {}
 
-        Vector2i _windowSize, _framebufferSize;
-        Vector2 _dpiScaling;
+        const Vector2i _windowSize;
+        const Vector2i _framebufferSize;
+        const Vector2 _dpiScaling;
 };
 
 /**
@@ -1624,9 +1637,9 @@ class GlfwApplication::MouseMoveEvent: public GlfwApplication::InputEvent {
     private:
         explicit MouseMoveEvent(GLFWwindow* window, const Vector2i& position): _window{window}, _position{position} {}
 
-        GLFWwindow* _window;
-        Containers::Optional<Buttons> _buttons;
+        GLFWwindow* const _window;
         const Vector2i _position;
+        Containers::Optional<Buttons> _buttons;
         Containers::Optional<Modifiers> _modifiers;
 };
 
@@ -1659,7 +1672,7 @@ class GlfwApplication::MouseScrollEvent: public GlfwApplication::InputEvent {
     private:
         explicit MouseScrollEvent(GLFWwindow* window, const Vector2& offset): _window{window}, _offset{offset} {}
 
-        GLFWwindow* _window;
+        GLFWwindow* const _window;
         const Vector2 _offset;
         Containers::Optional<Vector2i> _position;
         Containers::Optional<Modifiers> _modifiers;
@@ -1705,7 +1718,7 @@ class GlfwApplication::TextInputEvent {
     private:
         explicit TextInputEvent(Containers::ArrayView<const char> text): _text{text}, _accepted{false} {}
 
-        Containers::ArrayView<const char> _text;
+        const Containers::ArrayView<const char> _text;
         bool _accepted;
 };
 
diff --git a/src/Magnum/Platform/Sdl2Application.h b/src/Magnum/Platform/Sdl2Application.h
index 9ec185888..9991dbf4b 100644
--- a/src/Magnum/Platform/Sdl2Application.h
+++ b/src/Magnum/Platform/Sdl2Application.h
@@ -1682,6 +1682,18 @@ class Sdl2Application::ExitEvent {
 */
 class Sdl2Application::ViewportEvent {
     public:
+        /** @brief Copying is not allowed */
+        ViewportEvent(const ViewportEvent&) = delete;
+
+        /** @brief Moving is not allowed */
+        ViewportEvent(ViewportEvent&&) = delete;
+
+        /** @brief Copying is not allowed */
+        ViewportEvent& operator=(const ViewportEvent&) = delete;
+
+        /** @brief Moving is not allowed */
+        ViewportEvent& operator=(ViewportEvent&&) = delete;
+
         /**
          * @brief Window size
          *
@@ -1718,8 +1730,9 @@ class Sdl2Application::ViewportEvent {
 
         explicit ViewportEvent(const Vector2i& windowSize, const Vector2i& framebufferSize, const Vector2& dpiScaling): _windowSize{windowSize}, _framebufferSize{framebufferSize}, _dpiScaling{dpiScaling} {}
 
-        Vector2i _windowSize, _framebufferSize;
-        Vector2 _dpiScaling;
+        const Vector2i _windowSize;
+        const Vector2i _framebufferSize;
+        const Vector2 _dpiScaling;
 };
 
 /**
@@ -2273,10 +2286,10 @@ class Sdl2Application::MultiGestureEvent {
     private:
         explicit MultiGestureEvent(const Vector2& center, Float relativeRotation, Float relativeDistance, Int fingerCount): _center{center}, _relativeRotation{relativeRotation}, _relativeDistance{relativeDistance}, _fingerCount{fingerCount}, _accepted{false} {}
 
-        Vector2 _center;
-        Float _relativeRotation,
-            _relativeDistance;
-        Int _fingerCount;
+        const Vector2 _center;
+        const Float _relativeRotation;
+        const Float _relativeDistance;
+        const Int _fingerCount;
         bool _accepted;
 };
 
@@ -2320,7 +2333,7 @@ class Sdl2Application::TextInputEvent {
     private:
         explicit TextInputEvent(Containers::ArrayView<const char> text): _text{text}, _accepted{false} {}
 
-        Containers::ArrayView<const char> _text;
+        const Containers::ArrayView<const char> _text;
         bool _accepted;
 };
 
@@ -2370,8 +2383,9 @@ class Sdl2Application::TextEditingEvent {
     private:
         explicit TextEditingEvent(Containers::ArrayView<const char> text, Int start, Int length): _text{text}, _start{start}, _length{length}, _accepted{false} {}
 
-        Containers::ArrayView<const char> _text;
-        Int _start, _length;
+        const Containers::ArrayView<const char> _text;
+        const Int _start;
+        const Int _length;
         bool _accepted;
 };