diff --git a/src/libboard_artiq/src/cxp_proto.rs b/src/libboard_artiq/src/cxp_proto.rs
index 69223a3..5e5c32f 100644
--- a/src/libboard_artiq/src/cxp_proto.rs
+++ b/src/libboard_artiq/src/cxp_proto.rs
@@ -172,10 +172,8 @@ impl Packet {
                     writer.write(&data[0..length as usize])?;
                 }
 
-                print_packet(&writer.get_ref()[4..writer.position()]);
-
-                let checksum = crc32::checksum_ieee(&writer.get_ref()[4..writer.position()]);
-                writer.write(&(!checksum).to_le_bytes())?;
+                let checksum = (!crc::crc32::checksum_ieee(&writer.get_ref()[4..writer.position()])).swap_bytes();
+                writer.write(&checksum.to_be_bytes())?;
             }
             _ => return Err(Error::UnknownPacket(0)),
         }
@@ -188,8 +186,8 @@ impl Packet {
             | Packet::CtrlWrite { .. }
             | Packet::CtrlReadWithTag { .. }
             | Packet::CtrlWriteWithTag { .. } => {
-                let checksum = crc32::checksum_ieee(&writer.get_ref()[4..writer.position()]);
-                writer.write(&(!checksum).to_le_bytes())?;
+                let checksum = (!crc::crc32::checksum_ieee(&writer.get_ref()[4..writer.position()])).swap_bytes();
+                writer.write(&checksum.to_be_bytes())?;
             }
             _ => {}
         }