diff --git a/lib/vector-buffers/src/variants/disk_v2/io.rs b/lib/vector-buffers/src/variants/disk_v2/io.rs
index 88b9b547806f0..e81ec5c80a69b 100644
--- a/lib/vector-buffers/src/variants/disk_v2/io.rs
+++ b/lib/vector-buffers/src/variants/disk_v2/io.rs
@@ -6,6 +6,7 @@ use tokio::{
     io::{AsyncRead, AsyncWrite},
 };
 
+#[cfg(unix)]
 const FILE_MODE_OWNER_RW_GROUP_RO: u32 = 0o640;
 
 /// File metadata.