diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 48f01ff..c1db7df 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -199,7 +199,7 @@
     size_t i;
     for (i = 0; i < OSSL_NELEM(nid_list); i++) {
         if (nid_list[i].nid == nid)
-            return i + 1;
+            return (uint16_t)(i + 1);
     }
     return 0;
 }