diff --git a/fes.html b/fes.html
index 2aa7a06..760439c 100644
--- a/fes.html
+++ b/fes.html
@@ -30,7 +30,7 @@
   <main class="main" role="main">
     <div class="map-wrapper">
       <div id="map" class="map-container" aria-live="polite" aria-label="文化祭マップ">
-        <img id="mapImage" src="images/1F.png" alt="学校見取り図 1階">
+        <img id="mapImage" src="images/1floor.png" alt="学校見取り図 1階">
         <!-- pins / tooltips inserted by script.js -->
       </div>
     </div>