diff --git a/src/api/system.c b/src/api/system.c
index 4901404d..dc87b723 100644
--- a/src/api/system.c
+++ b/src/api/system.c
@@ -21,8 +21,8 @@ static const char* button_name(int button) {
     case SDL_BUTTON_LEFT   : return "left";
     case SDL_BUTTON_MIDDLE : return "middle";
     case SDL_BUTTON_RIGHT  : return "right";
-    case SDL_BUTTON_X1     : return "x1";
-    case SDL_BUTTON_X2     : return "x2";
+    case SDL_BUTTON_X1     : return "x";
+    case SDL_BUTTON_X2     : return "y";
     default : return "?";
   }
 }