diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 062ff25..c1436c5 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -8233,7 +8233,7 @@
     }
 
     if( input_offset != len )
-        return PSA_ERROR_INVALID_ARGUMENT;
+        return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE;
 
     return( 0 );
 }
diff --git a/library/ssl_tls12_client.c b/library/ssl_tls12_client.c
index 8fcf5a4..7c293ec 100644
--- a/library/ssl_tls12_client.c
+++ b/library/ssl_tls12_client.c
@@ -2354,7 +2354,7 @@
 
         if( ( *p != MBEDTLS_ECP_TLS_NAMED_CURVE ) ||
             ( read_tls_id != curve_info->tls_id ) )
-            return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+            return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
 
         p += 3;