diff --git a/_includes/disqus.html b/_includes/disqus.html
index e3b83a013..5879ac6bf 100644
--- a/_includes/disqus.html
+++ b/_includes/disqus.html
@@ -29,5 +29,26 @@
     }
   }, { threshold: [0] });
 
-  disqus_observer.observe(document.querySelector("#disqus_thread"));
+  disqus_observer.observe(document.querySelector('#disqus_thread'));
+
+  /* Auto switch theme */
+
+  function reloadDisqus() {
+    /* Disqus hasn't been loaded */
+    if (typeof DISQUS === "undefined") {
+      return;
+    }
+
+    if (document.readyState == 'complete') {
+      DISQUS.reset({ reload: true, config: disqus_config });
+    }
+  }
+
+  const modeToggle = document.querySelector(".mode-toggle");
+
+  if (modeToggle !== null) {
+    modeToggle.addEventListener('click', reloadDisqus);
+    window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', reloadDisqus);
+  }
+
 </script>