diff --git a/crypto/objects/obj_dat.c b/crypto/objects/obj_dat.c
index 3df7ff245..6a068eef4 100644
--- a/crypto/objects/obj_dat.c
+++ b/crypto/objects/obj_dat.c
@@ -380,6 +380,8 @@ static int obj_cmp(const ASN1_OBJECT *const *ap, const unsigned int *bp)
     j = (a->length - b->length);
     if (j)
         return (j);
+    if (a->length == 0)
+        return 0;
     return (memcmp(a->data, b->data, a->length));
 }