diff --git a/app/components/NDS.vue b/app/components/NDS.vue
index 8a7440b..052b441 100644
--- a/app/components/NDS.vue
+++ b/app/components/NDS.vue
@@ -217,7 +217,7 @@ const keyToButton: Record<string, string> = {
 };
 
 useKeyDown((key) => {
-  const button = keyToButton[key];
+  const button = keyToButton[key.toLowerCase()];
   if (button) {
     physicalButtonsDown.add(button);
     window.dispatchEvent(
@@ -227,7 +227,7 @@ useKeyDown((key) => {
 });
 
 useKeyUp((key) => {
-  const button = keyToButton[key];
+  const button = keyToButton[key.toLowerCase()];
   if (button) {
     physicalButtonsDown.delete(button);
     window.dispatchEvent(new KeyboardEvent("keyup", { key: `NDS_${button}` }));
diff --git a/app/pages/index.vue b/app/pages/index.vue
index eee0cc0..c48da82 100644
--- a/app/pages/index.vue
+++ b/app/pages/index.vue
@@ -34,7 +34,7 @@ const keyToButton: Record<string, string> = {
 // like who choose Nuxt to build such an app
 useKeyDown((key) => {
   if (app.settings.renderingMode === "3d") return;
-  const button = keyToButton[key];
+  const button = keyToButton[key.toLowerCase()];
   if (button) {
     window.dispatchEvent(
       new KeyboardEvent("keydown", { key: `NDS_${button}` }),
@@ -60,7 +60,7 @@ useKeyDown((key) => {
 
 useKeyUp((key) => {
   if (app.settings.renderingMode === "3d") return;
-  const button = keyToButton[key];
+  const button = keyToButton[key.toLowerCase()];
   if (button) {
     window.dispatchEvent(new KeyboardEvent("keyup", { key: `NDS_${button}` }));
   }