diff --git a/src/Mapscii.js b/src/Mapscii.js
index 168abac..ff57f71 100644
--- a/src/Mapscii.js
+++ b/src/Mapscii.js
@@ -205,7 +205,8 @@ class Mapscii {
       case 'a':
         this.zoomBy(config.zoomStep);
         break;
-      case 'z', 'y':
+      case 'y':
+      case 'z':
         this.zoomBy(-config.zoomStep);
         break;
       case 'left':