diff --git a/src/builder.rs b/src/builder.rs
index 46b4a03..233e6b1 100644
--- a/src/builder.rs
+++ b/src/builder.rs
@@ -626,7 +626,7 @@ impl IsoBuilder {
 			"lzo" => "-comp lzo",
 			"lz4" => "-comp lz4 -Xhc",
 			"xz" => "-comp xz -Xbcj x86",
-			"zstd" => "-comp zstd -Xcompression-level 19",
+			"zstd" => "-comp zstd -Xcompression-level 22",
 			"lzma" => "-comp lzma",
 			_ => bail!("Unknown squashfs compression: {sqfs_comp}"),
 		}