diff --git a/services/llio/src/api/i2c_api.rs b/services/llio/src/api/i2c_api.rs
index 91bcb0a6d..df80c99df 100644
--- a/services/llio/src/api/i2c_api.rs
+++ b/services/llio/src/api/i2c_api.rs
@@ -33,17 +33,14 @@ pub(crate) enum I2cCallback {
 // and create a "public" version for return values via callbacks. But for now, it's pretty
 // convenient to reach into the state of the I2C machine to debug problems in the callbacks.
 #[allow(dead_code)]
-pub (crate) const I2C_MAX_LEN: usize = 33; // note: due to a regression in Rust 1.56, we can't use the I2C_MAX_LEN symbol in the structure below. So you must manually update that if you change it here.
-// pending https://github.com/rust-lang/rust/issues/90195
+pub (crate) const I2C_MAX_LEN: usize = 33;
 #[derive(Debug, Copy, Clone, Archive, Serialize, Deserialize)]
 pub struct I2cTransaction {
     pub bus_addr: u8,
     // write address and read address are encoded in the packet field below
-    // NOTE: the number 33 that appears twice below mirrors I2C_MAX_LEN; due to a regression in Rust 1.56 we can't use constants in array types
-    // pending https://github.com/rust-lang/rust/issues/90195
-    pub txbuf: Option<[u8; 33]>,
+    pub txbuf: Option<[u8; I2C_MAX_LEN]>,
     pub txlen: u32,
-    pub rxbuf: Option<[u8; 33]>,
+    pub rxbuf: Option<[u8; I2C_MAX_LEN]>,
     pub rxlen: u32,
     pub listener: Option<(u32, u32, u32, u32)>, // where Rx split transactions should be routed to
     pub timeout_ms: u32,
@@ -78,7 +75,7 @@ pub struct I2cAsyncReadHook {
 /// The data reported by an I2cAsycReadHook message
 #[derive(Debug, Copy, Clone, Archive, Serialize, Deserialize)]
 pub struct I2cReadResult {
-    pub rxbuf: [u8; 33],
+    pub rxbuf: [u8; I2C_MAX_LEN],
     pub rxlen: u32,
     pub status: I2cStatus,
 }