diff --git a/subprojects/language-web/src/main/java/tools/refinery/language/web/CacheControlFilter.java b/subprojects/language-web/src/main/java/tools/refinery/language/web/CacheControlFilter.java
index 99c90597..72e937fd 100644
--- a/subprojects/language-web/src/main/java/tools/refinery/language/web/CacheControlFilter.java
+++ b/subprojects/language-web/src/main/java/tools/refinery/language/web/CacheControlFilter.java
@@ -20,7 +20,7 @@ public class CacheControlFilter implements Filter {
 
 	private static final Set<String> CACHE_URI_DENYLIST = Set.of("apple-touch-icon.png", "config.json", "favicon.png",
 			"favicon.svg", "favicon-96x96.png", "health", "icon-any.svg", "icon-192x192.png", "icon-512x512.png",
-			"mask-icon.svg", "sw.js");
+			"manifest.webmanifest", "mask-icon.svg", "sw.js");
 
 	private static final Duration EXPIRY = Duration.ofDays(365);