diff --git a/Cargo.lock b/Cargo.lock
index 91c070c5..0a72dc35 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -418,7 +418,7 @@ dependencies = [
 
 [[package]]
 name = "rustls-webpki"
-version = "0.104.0-alpha.3"
+version = "0.104.0-alpha.4"
 dependencies = [
  "base64",
  "bencher",
diff --git a/Cargo.toml b/Cargo.toml
index 962bd128..9a709a84 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,7 +21,7 @@ license = "ISC"
 name = "rustls-webpki"
 readme = "README.md"
 repository = "https://github.com/rustls/webpki"
-version = "0.104.0-alpha.3"
+version = "0.104.0-alpha.4"
 
 include = [
     "Cargo.toml",
diff --git a/src/sct.rs b/src/sct.rs
index e49d2516..da2fbe39 100644
--- a/src/sct.rs
+++ b/src/sct.rs
@@ -1,3 +1,5 @@
+use core::error::Error as StdError;
+use core::fmt;
 use core::marker::PhantomData;
 
 use untrusted::{Input, Reader};
@@ -136,6 +138,17 @@ pub enum Error {
     UnsupportedSctVersion,
 }
 
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::MalformedSct => write!(f, "malformed SCT"),
+            Self::UnsupportedSctVersion => write!(f, "unsupported SCT version"),
+        }
+    }
+}
+
+impl StdError for Error {}
+
 #[cfg(test)]
 mod tests {
     use super::*;