diff --git a/internal/uidriver/glfw/ui.go b/internal/uidriver/glfw/ui.go
index 824314f7a..63ef1c722 100644
--- a/internal/uidriver/glfw/ui.go
+++ b/internal/uidriver/glfw/ui.go
@@ -822,23 +822,6 @@ event:
 			time.Sleep(time.Millisecond)
 		}
 	}
-	if u.defaultFramebufferSizeCallback == 0 {
-		// When the window gets resized (either by manual window resize or a window
-		// manager), glfw sends a framebuffer size callback which we need to handle (#1960).
-		// This event is the only way to handle the size change at least on i3 window manager.
-		u.defaultFramebufferSizeCallback = glfw.ToFramebufferSizeCallback(func(_ *glfw.Window, w, h int) {
-			if u.isFullscreen() {
-				return
-			}
-
-			// The framebuffer size is always scaled by the device scale factor (#1975).
-			// See also the implementation in uiContext.updateOffscreen.
-			s := u.deviceScaleFactor(u.currentMonitor())
-			ww := int(float64(w) / s)
-			wh := int(float64(h) / s)
-			u.setWindowSizeInDIP(ww, wh, u.isFullscreen())
-		})
-	}
 	window.SetFramebufferSizeCallback(u.defaultFramebufferSizeCallback)
 
 	close(u.framebufferSizeCallbackCh)
@@ -922,6 +905,23 @@ func (u *UserInterface) init() error {
 		u.window.Maximize()
 	}
 
+	// When the window gets resized (either by manual window resize or a window
+	// manager), glfw sends a framebuffer size callback which we need to handle (#1960).
+	// This event is the only way to handle the size change at least on i3 window manager.
+	u.defaultFramebufferSizeCallback = glfw.ToFramebufferSizeCallback(func(_ *glfw.Window, w, h int) {
+		if u.isFullscreen() {
+			return
+		}
+
+		// The framebuffer size is always scaled by the device scale factor (#1975).
+		// See also the implementation in uiContext.updateOffscreen.
+		s := u.deviceScaleFactor(u.currentMonitor())
+		ww := int(float64(w) / s)
+		wh := int(float64(h) / s)
+		u.setWindowSizeInDIP(ww, wh, u.isFullscreen())
+	})
+	u.window.SetFramebufferSizeCallback(u.defaultFramebufferSizeCallback)
+
 	u.window.SetTitle(u.title)
 	u.window.Show()