diff --git a/common/src/main/java/de/bluecolored/bluemap/common/web/MapStorageRequestHandler.java b/common/src/main/java/de/bluecolored/bluemap/common/web/MapStorageRequestHandler.java
index 94c8ec23..c85c0f5f 100644
--- a/common/src/main/java/de/bluecolored/bluemap/common/web/MapStorageRequestHandler.java
+++ b/common/src/main/java/de/bluecolored/bluemap/common/web/MapStorageRequestHandler.java
@@ -130,7 +130,7 @@ private void writeToResponse(CompressedInputStream data, HttpResponse response,
         ) {
             response.addHeader("Content-Encoding", Compression.GZIP.getId());
             ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
-            try (OutputStream os = Compression.GZIP.compress(byteOut)) {
+            try (data; OutputStream os = Compression.GZIP.compress(byteOut)) {
                 data.decompress().transferTo(os);
             }
             byte[] compressedData = byteOut.toByteArray();