diff --git a/src/bl2.rs b/src/bl2.rs
index b3dcec6..0d31bcf 100644
--- a/src/bl2.rs
+++ b/src/bl2.rs
@@ -3,8 +3,8 @@ use std::slice;
 use std::time::Duration;
 use serialport::{ClearBuffer, SerialPort};
 
-static BL2_HANDSHAKE_REQ: &[u8] = "mudl".as_bytes();
-static BL2_HANDSHAKE_RESP: &[u8] = "TF-A".as_bytes();
+const BL2_HANDSHAKE_REQ: &[u8] = "mudl".as_bytes();
+const BL2_HANDSHAKE_RESP: &[u8] = "TF-A".as_bytes();
 
 pub struct BL2 {
     port: Box<dyn SerialPort>,
@@ -142,4 +142,4 @@ impl BL2 {
     pub fn go(&mut self) {
         self.echo(slice::from_ref(&4));
     }
-}
\ No newline at end of file
+}
diff --git a/src/bootrom.rs b/src/bootrom.rs
index 4ef9fbd..195aa09 100644
--- a/src/bootrom.rs
+++ b/src/bootrom.rs
@@ -3,7 +3,7 @@ use std::slice;
 use std::time::Duration;
 use serialport::{ClearBuffer, SerialPort};
 
-static BROM_HANDSHAKE: &[u8] = &[0xa0, 0x0a, 0x50, 0x05];
+const BROM_HANDSHAKE: &[u8] = &[0xa0, 0x0a, 0x50, 0x05];
 pub struct BootROM {
     port: Box<dyn SerialPort>,
 }
@@ -159,4 +159,4 @@ impl BootROM {
             panic!("jump_da64 magic status: {}", ret);
         }
     }
-}
\ No newline at end of file
+}