diff --git a/gallery.html b/gallery.html
index 3cae0afc..ab1671a1 100644
--- a/gallery.html
+++ b/gallery.html
@@ -116,8 +116,8 @@
             <h3>Geotagged images</h3>
             <p>GPXSee showing geotagged JPEGs</p>
           </li><li>
-            <a href="gallery/DEM+GPS.png">
-              <img src="gallery/DEM+GPS_prev.png" width="200" height="276" alt=""/>
+            <a href="gallery/DEM-GPS.png">
+              <img src="gallery/DEM-GPS_prev.png" width="200" height="276" alt=""/>
             </a>
             <h3>DEM+GPS elevation</h3>
             <p>DEM and GPS elevation comparison</p>
diff --git a/gallery/DEM+GPS.png b/gallery/DEM-GPS.png
similarity index 100%
rename from gallery/DEM+GPS.png
rename to gallery/DEM-GPS.png
diff --git a/gallery/DEM+GPS_prev.png b/gallery/DEM-GPS_prev.png
similarity index 100%
rename from gallery/DEM+GPS_prev.png
rename to gallery/DEM-GPS_prev.png