diff --git a/etherparse/src/net/ipv4_ecn.rs b/etherparse/src/net/ipv4_ecn.rs
index d9a5e5df..5a87921d 100644
--- a/etherparse/src/net/ipv4_ecn.rs
+++ b/etherparse/src/net/ipv4_ecn.rs
@@ -16,7 +16,14 @@ impl Ipv4Ecn {
     pub const TWO: Ipv4Ecn = Ipv4Ecn(2);
 
     /// Ipv4Ecn with value 0.
-    pub const TRHEE: Ipv4Ecn = Ipv4Ecn(3);
+    pub const THREE: Ipv4Ecn = Ipv4Ecn(3);
+
+    #[deprecated(
+        since = "0.18.0",
+        note = "Please use Ipv4Ecn::THREE instead."
+    )]
+    /// Deprecated, use [`crate::Ipv4Ecn::THREE`] instead.
+    pub const TRHEE: Ipv4Ecn = Ipv4Ecn::THREE;
 
     /// Maximum value of an IPv4 header ECN.
     pub const MAX_U8: u8 = 0b0000_0011;