diff --git a/src/component/keyboard/KeyZoomHandler.ts b/src/component/keyboard/KeyZoomHandler.ts
index a44f89b2..12522a28 100644
--- a/src/component/keyboard/KeyZoomHandler.ts
+++ b/src/component/keyboard/KeyZoomHandler.ts
@@ -61,6 +61,7 @@ export class KeyZoomHandler extends HandlerBase<KeyboardConfiguration> {
                             delta = 1;
                             break;
                         case "-":
+                        case "_":
                             delta = -1;
                             break;
                         default: