diff --git a/src/content-script.js b/src/content-script.js
index c891ac0..7de761f 100644
--- a/src/content-script.js
+++ b/src/content-script.js
@@ -1,4 +1,10 @@
 (() => {
+  if (location.host === "scrapbox.io") {
+    // Dirty hack for mimicking 'non-touchable device (normal Mac)' to Scrapbox
+    // (as of 5/24 2020, it uses `ontouchstart === undefined` to check whether the device is iPadOS or not)
+    Object.defineProperty(document, "ontouchstart", { get: () => void 0 });
+  }
+
   let beginTime = Date.now();
 
   function log(message) {
@@ -646,10 +652,6 @@
     }
 
     function initializeScrapbox() {
-      // Dirty hack for mimicking 'non-touchable device (normal Mac)' to Scrapbox
-      // (as of 5/24 2020, it uses `ontouchstart === undefined` to check whether the device is iPadOS or not)
-      Object.defineProperty(document, "ontouchstart", { get: () => void 0 });
-
       gRichTextEditorInputElement = document.getElementById("text-input");
       setupInCompositionHandler(gRichTextEditorInputElement, ev =>
         keysnail.dispatchKey("Backspace")