diff --git a/java-utils/mvn_build.py b/java-utils/mvn_build.py
index ce12e905..ee1335b9 100644
--- a/java-utils/mvn_build.py
+++ b/java-utils/mvn_build.py
@@ -193,7 +193,7 @@ def goal_callback(option, opt_str, value, parser):
             builddep_data = file.read()
         #compressed = gzip.compress(builddep_data, mtime=0)
         buf = io.BytesIO()
-        with gzip.GzipFile(fileobj=buf, mode='wb', mtime=0) as f:
+        with gzip.GzipFile(fileobj=buf, mode='wb', mtime=0, compresslevel=9) as f:
             f.write(builddep_data)
         compressed = buf.getvalue()
         encoded = base64.b64encode(compressed).decode()