diff --git a/capi/include/hyper.h b/capi/include/hyper.h
index 78934710af..cfc14a25fa 100644
--- a/capi/include/hyper.h
+++ b/capi/include/hyper.h
@@ -54,6 +54,10 @@ typedef enum {
    An optional hyper feature was not enabled.
    */
   HYPERE_FEATURE_NOT_ENABLED,
+  /*
+   The peer sent an HTTP message that could not be parsed.
+   */
+  HYPERE_INVALID_PEER_MESSAGE,
 } hyper_code;
 
 typedef enum {
diff --git a/src/ffi/error.rs b/src/ffi/error.rs
index 5dfca54ea9..eb563a60d5 100644
--- a/src/ffi/error.rs
+++ b/src/ffi/error.rs
@@ -20,6 +20,8 @@ pub enum hyper_code {
     /// An optional hyper feature was not enabled.
     #[cfg_attr(feature = "http2", allow(unused))]
     HYPERE_FEATURE_NOT_ENABLED,
+    /// The peer sent an HTTP message that could not be parsed.
+    HYPERE_INVALID_PEER_MESSAGE,
 }
 
 // ===== impl hyper_error =====
@@ -30,6 +32,7 @@ impl hyper_error {
         use crate::error::User;
 
         match self.0.kind() {
+            ErrorKind::Parse(_) => hyper_code::HYPERE_INVALID_PEER_MESSAGE,
             ErrorKind::IncompleteMessage => hyper_code::HYPERE_UNEXPECTED_EOF,
             ErrorKind::User(User::AbortedByCallback) => hyper_code::HYPERE_ABORTED_BY_CALLBACK,
             // TODO: add more variants