diff --git a/ssl/t1_lib.cc b/ssl/t1_lib.cc
index a7bfec4..8d03623 100644
--- a/ssl/t1_lib.cc
+++ b/ssl/t1_lib.cc
@@ -2147,6 +2147,7 @@
   if (!CBS_get_u16(contents, &group_id) ||
       !CBS_get_u16_length_prefixed(contents, &peer_key) ||
       CBS_len(contents) != 0) {
+    OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
     *out_alert = SSL_AD_DECODE_ERROR;
     return false;
   }