diff --git a/artiq/firmware/runtime/analyzer.rs b/artiq/firmware/runtime/analyzer.rs
index 355da1977..18ada4d4f 100644
--- a/artiq/firmware/runtime/analyzer.rs
+++ b/artiq/firmware/runtime/analyzer.rs
@@ -10,7 +10,7 @@ use core::cell::RefCell;
 
 const BUFFER_SIZE: usize = 512 * 1024;
 
-#[repr(align(64))]
+#[repr(align(2048))]
 struct Buffer {
     data: [u8; BUFFER_SIZE],
 }