diff --git a/library/pk.c b/library/pk.c
index 8e42b8d..d30205c 100644
--- a/library/pk.c
+++ b/library/pk.c
@@ -825,7 +825,8 @@
             return MBEDTLS_ERR_PK_TYPE_MISMATCH;
         }
     } else {
-        if (pub->pk_info != prv->pk_info) {
+        if ((prv->pk_info->type != MBEDTLS_PK_OPAQUE) &&
+            (pub->pk_info != prv->pk_info)) {
             return MBEDTLS_ERR_PK_TYPE_MISMATCH;
         }
     }