diff --git a/src/ol/source/Tile.js b/src/ol/source/Tile.js
index 3eda3a99c0..9ea34b0ea7 100644
--- a/src/ol/source/Tile.js
+++ b/src/ol/source/Tile.js
@@ -78,7 +78,7 @@ class TileSource extends Source {
       const canUseScreen = 'screen ' in self;
       const width = canUseScreen ? (screen.availWidth || screen.width) : 1920;
       const height = canUseScreen ? (screen.availHeight || screen.height) : 1080;
-      cacheSize = 2 * Math.ceil(width / tileSize[0]) * Math.ceil(height / tileSize[1]);
+      cacheSize = 4 * Math.ceil(width / tileSize[0]) * Math.ceil(height / tileSize[1]);
     }
 
     /**