diff --git a/src/wl_init.c b/src/wl_init.c
index e83c6992..cbd9d4ec 100644
--- a/src/wl_init.c
+++ b/src/wl_init.c
@@ -507,6 +507,8 @@ int _glfwInitWayland(void)
     _glfw.wl.keyRepeatTimerfd = -1;
     _glfw.wl.cursorTimerfd = -1;
 
+    _glfw.wl.tag = glfwGetVersionString();
+
     _glfw.wl.client.display_flush = (PFN_wl_display_flush)
         _glfwPlatformGetModuleSymbol(_glfw.wl.client.handle, "wl_display_flush");
     _glfw.wl.client.display_cancel_read = (PFN_wl_display_cancel_read)
@@ -537,6 +539,10 @@ int _glfwInitWayland(void)
         _glfwPlatformGetModuleSymbol(_glfw.wl.client.handle, "wl_proxy_get_user_data");
     _glfw.wl.client.proxy_set_user_data = (PFN_wl_proxy_set_user_data)
         _glfwPlatformGetModuleSymbol(_glfw.wl.client.handle, "wl_proxy_set_user_data");
+    _glfw.wl.client.proxy_get_tag = (PFN_wl_proxy_get_tag)
+        _glfwPlatformGetModuleSymbol(_glfw.wl.client.handle, "wl_proxy_get_tag");
+    _glfw.wl.client.proxy_set_tag = (PFN_wl_proxy_set_tag)
+        _glfwPlatformGetModuleSymbol(_glfw.wl.client.handle, "wl_proxy_set_tag");
     _glfw.wl.client.proxy_get_version = (PFN_wl_proxy_get_version)
         _glfwPlatformGetModuleSymbol(_glfw.wl.client.handle, "wl_proxy_get_version");
     _glfw.wl.client.proxy_marshal_flags = (PFN_wl_proxy_marshal_flags)
@@ -556,7 +562,9 @@ int _glfwInitWayland(void)
         !_glfw.wl.client.proxy_marshal_constructor ||
         !_glfw.wl.client.proxy_marshal_constructor_versioned ||
         !_glfw.wl.client.proxy_get_user_data ||
-        !_glfw.wl.client.proxy_set_user_data)
+        !_glfw.wl.client.proxy_set_user_data ||
+        !_glfw.wl.client.proxy_get_tag ||
+        !_glfw.wl.client.proxy_set_tag)
     {
         _glfwInputError(GLFW_PLATFORM_ERROR,
                         "Wayland: Failed to load libwayland-client entry point");
diff --git a/src/wl_monitor.c b/src/wl_monitor.c
index 3d4fcbb8..c847eb7e 100644
--- a/src/wl_monitor.c
+++ b/src/wl_monitor.c
@@ -191,6 +191,7 @@ void _glfwAddOutputWayland(uint32_t name, uint32_t version)
     monitor->wl.output = output;
     monitor->wl.name = name;
 
+    wl_proxy_set_tag((struct wl_proxy*) output, &_glfw.wl.tag);
     wl_output_add_listener(output, &outputListener, monitor);
 }
 
diff --git a/src/wl_platform.h b/src/wl_platform.h
index f28038de..81e6b5d7 100644
--- a/src/wl_platform.h
+++ b/src/wl_platform.h
@@ -61,6 +61,8 @@ typedef struct wl_proxy* (* PFN_wl_proxy_marshal_constructor)(struct wl_proxy*,u
 typedef struct wl_proxy* (* PFN_wl_proxy_marshal_constructor_versioned)(struct wl_proxy*,uint32_t,const struct wl_interface*,uint32_t,...);
 typedef void* (* PFN_wl_proxy_get_user_data)(struct wl_proxy*);
 typedef void (* PFN_wl_proxy_set_user_data)(struct wl_proxy*,void*);
+typedef void (* PFN_wl_proxy_set_tag)(struct wl_proxy*,const char*const*);
+typedef const char* const* (* PFN_wl_proxy_get_tag)(struct wl_proxy*);
 typedef uint32_t (* PFN_wl_proxy_get_version)(struct wl_proxy*);
 typedef struct wl_proxy* (* PFN_wl_proxy_marshal_flags)(struct wl_proxy*,uint32_t,const struct wl_interface*,uint32_t,uint32_t,...);
 #define wl_display_flush _glfw.wl.client.display_flush
@@ -78,6 +80,8 @@ typedef struct wl_proxy* (* PFN_wl_proxy_marshal_flags)(struct wl_proxy*,uint32_
 #define wl_proxy_marshal_constructor_versioned _glfw.wl.client.proxy_marshal_constructor_versioned
 #define wl_proxy_get_user_data _glfw.wl.client.proxy_get_user_data
 #define wl_proxy_set_user_data _glfw.wl.client.proxy_set_user_data
+#define wl_proxy_get_tag _glfw.wl.client.proxy_get_tag
+#define wl_proxy_set_tag _glfw.wl.client.proxy_set_tag
 #define wl_proxy_get_version _glfw.wl.client.proxy_get_version
 #define wl_proxy_marshal_flags _glfw.wl.client.proxy_marshal_flags
 
@@ -311,6 +315,8 @@ typedef struct _GLFWlibraryWayland
     _GLFWwindow*                dragFocus;
     uint32_t                    dragSerial;
 
+    const char*                 tag;
+
     struct wl_cursor_theme*     cursorTheme;
     struct wl_cursor_theme*     cursorThemeHiDPI;
     struct wl_surface*          cursorSurface;
@@ -388,6 +394,8 @@ typedef struct _GLFWlibraryWayland
         PFN_wl_proxy_marshal_constructor_versioned  proxy_marshal_constructor_versioned;
         PFN_wl_proxy_get_user_data                  proxy_get_user_data;
         PFN_wl_proxy_set_user_data                  proxy_set_user_data;
+        PFN_wl_proxy_get_tag                        proxy_get_tag;
+        PFN_wl_proxy_set_tag                        proxy_set_tag;
         PFN_wl_proxy_get_version                    proxy_get_version;
         PFN_wl_proxy_marshal_flags                  proxy_marshal_flags;
     } client;
diff --git a/src/wl_window.c b/src/wl_window.c
index 697b6a0e..5b194e89 100644
--- a/src/wl_window.c
+++ b/src/wl_window.c
@@ -199,6 +199,7 @@ static void createFallbackDecoration(_GLFWdecorationWayland* decoration,
                                      int width, int height)
 {
     decoration->surface = wl_compositor_create_surface(_glfw.wl.compositor);
+    wl_proxy_set_tag((struct wl_proxy*) decoration->surface, &_glfw.wl.tag);
     decoration->subsurface =
         wl_subcompositor_get_subsurface(_glfw.wl.subcompositor,
                                         decoration->surface, parent);
@@ -371,6 +372,9 @@ static void surfaceHandleEnter(void* userData,
                                struct wl_surface* surface,
                                struct wl_output* output)
 {
+    if (wl_proxy_get_tag((struct wl_proxy*) output) != &_glfw.wl.tag)
+        return;
+
     _GLFWwindow* window = userData;
     _GLFWmonitor* monitor = wl_output_get_user_data(output);
 
@@ -391,6 +395,9 @@ static void surfaceHandleLeave(void* userData,
                                struct wl_surface* surface,
                                struct wl_output* output)
 {
+    if (wl_proxy_get_tag((struct wl_proxy*) output) != &_glfw.wl.tag)
+        return;
+
     _GLFWwindow* window = userData;
     _GLFWmonitor* monitor = wl_output_get_user_data(output);
     GLFWbool found = GLFW_FALSE;
@@ -729,6 +736,7 @@ static GLFWbool createNativeSurface(_GLFWwindow* window,
         return GLFW_FALSE;
     }
 
+    wl_proxy_set_tag((struct wl_proxy*) window->wl.surface, &_glfw.wl.tag);
     wl_surface_add_listener(window->wl.surface,
                             &surfaceListener,
                             window);
@@ -1063,6 +1071,9 @@ static void pointerHandleEnter(void* userData,
     if (!surface)
         return;
 
+    if (wl_proxy_get_tag((struct wl_proxy*) surface) != &_glfw.wl.tag)
+        return;
+
     _GLFWdecorationSideWayland focus = mainWindow;
     _GLFWwindow* window = wl_surface_get_user_data(surface);
     if (!window)
@@ -1088,8 +1099,13 @@ static void pointerHandleLeave(void* userData,
                                uint32_t serial,
                                struct wl_surface* surface)
 {
-    _GLFWwindow* window = _glfw.wl.pointerFocus;
+    if (!surface)
+        return;
 
+    if (wl_proxy_get_tag((struct wl_proxy*) surface) != &_glfw.wl.tag)
+        return;
+
+    _GLFWwindow* window = _glfw.wl.pointerFocus;
     if (!window)
         return;
 
@@ -1681,7 +1697,10 @@ static void dataDeviceHandleEnter(void* userData,
             _GLFWwindow* window = NULL;
 
             if (surface)
-                window = wl_surface_get_user_data(surface);
+            {
+                if (wl_proxy_get_tag((struct wl_proxy*) surface) == &_glfw.wl.tag)
+                    window = wl_surface_get_user_data(surface);
+            }
 
             if (window && _glfw.wl.offers[i].text_uri_list)
             {
@@ -1696,6 +1715,9 @@ static void dataDeviceHandleEnter(void* userData,
         }
     }
 
+    if (wl_proxy_get_tag((struct wl_proxy*) surface) != &_glfw.wl.tag)
+        return;
+
     if (_glfw.wl.dragOffer)
         wl_data_offer_accept(offer, serial, "text/uri-list");
     else