diff --git a/library/ecjpake.c b/library/ecjpake.c
index b276514..1845c93 100644
--- a/library/ecjpake.c
+++ b/library/ecjpake.c
@@ -226,7 +226,7 @@
     p += id_len;
 
     /* Compute hash */
-    mbedtls_md( md_info, buf, p - buf, hash );
+    MBEDTLS_MPI_CHK( mbedtls_md( md_info, buf, p - buf, hash ) );
 
     /* Turn it into an integer mod n */
     MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( h, hash,